Micron Document
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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Undeclared war</span></span>
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</style><div role="note" class="hatnote navigation-not-searchable">This article is about the type of military conflict. For the 1990 film, see <a href="Undeclared_War" title="Undeclared War">Undeclared War</a>. For the 2022 television series, see <a href="The_Undeclared_War" title="The Undeclared War">The Undeclared War</a>.</div>
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</style><table class="sidebar sidebar-collapse nomobile nowraplinks hlist" style="width:"><tbody><tr><td class="sidebar-pretitle">Part of a series on</td></tr><tr><th class="sidebar-title-with-pretitle" style="font-size:150%;"><span style="font-size:120%"><a href="War" title="War">War</a></span><br><span class="nobold"><span style="font-size: 85%;">(<a href="Outline_of_war" title="Outline of war">outline</a>)</span></span></th></tr><tr><td class="sidebar-image"><span typeof="mw:File"></span></td></tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military_history" title="Military history">History</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Prehistoric_warfare" title="Prehistoric warfare">Prehistoric</a></li>
<li><a href="Ancient_warfare" title="Ancient warfare">Ancient</a>
<ul><li><a href="Early_thermal_weapons" title="Early thermal weapons">Thermal</a></li>
<li><a href="History_of_gunpowder" title="History of gunpowder">Gunpowder</a>
<ul><li><a href="Timeline_of_the_gunpowder_age" title="Timeline of the gunpowder age">Timeline</a></li></ul></li></ul></li>
<li><a href="Medieval_warfare" title="Medieval warfare">Post-classical</a>
<ul><li><a href="Medieval_fortification" title="Medieval fortification">Castles</a></li></ul></li>
<li><a href="Early_modern_warfare" title="Early modern warfare">Early modern</a>
<ul><li><a href="Military_Revolution" title="Military Revolution">Military revolution</a></li>
<li><a href="Pike_and_shot" title="Pike and shot">Pike and shot</a></li>
<li><a href="Napoleonic_weaponry_and_warfare" title="Napoleonic weaponry and warfare">Napoleonic warfare</a></li></ul></li>
<li><a href="Modern_warfare" title="Modern warfare">Late modern</a>
<ul><li><a href="Industrial_warfare" title="Industrial warfare">Industrial warfare</a></li>
<li><a href="Fourth-generation_warfare" title="Fourth-generation warfare">Fourth-gen warfare</a></li>
<li><a href="Artificial_intelligence_arms_race" title="Artificial intelligence arms race">AI warfare</a></li></ul></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military" title="Military">Military</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Military_organization" title="Military organization">Organization</a></li>
<li><a href="Command_and_control" title="Command and control">Command and control</a></li>
<li><a href="Defense_ministry" class="mw-redirect" title="Defense ministry">Defense ministry</a></li>
<li><a href="Military_reserve_force" title="Military reserve force">Reserves</a></li>
<li><a href="Military_rank" title="Military rank">Ranks</a></li></ul>
<hr>
<ul><li><i>Branches:</i></li>
<li><a href="Army" title="Army">Army</a></li>
<li><a href="Navy" title="Navy">Navy</a></li>
<li><a href="Air_force" title="Air force">Air force</a></li>
<li><a href="Marines" title="Marines">Marines</a></li>
<li><a href="Coast_guard" title="Coast guard">Coast guard</a></li>
<li><a href="Border_guard" title="Border guard">Border guard</a></li>
<li><a href="Special_forces" title="Special forces">Special forces</a></li>
<li><a href="Cyber_force" title="Cyber force">Cyber force</a></li>
<li><a href="Space_force" title="Space force">Space force</a></li></ul>
<hr>
<ul><li><i>Specialties:</i></li>
<li><a href="Staff_(military)" title="Staff (military)">Staff</a></li>
<li><a href="Combat_engineer" title="Combat engineer">Engineers</a></li>
<li><a href="Military_intelligence" title="Military intelligence">Intel</a></li>
<li><a href="Reconnaissance" title="Reconnaissance">Recon</a></li>
<li><a href="Medical_corps" title="Medical corps">Medical</a></li>
<li><a href="Military_police" title="Military police">Police</a></li>
<li><a href="Military_diving" title="Military diving">Diving</a></li>
<li><a href="Aircraft_pilot" title="Aircraft pilot">Pilot</a></li></ul>
<hr>
<ul><li><i>Land units:</i></li>
<li><a href="Infantry" title="Infantry">Infantry</a></li>
<li><a href="Armoured_fighting_vehicle" title="Armoured fighting vehicle">Armor</a>
<ul><li><a href="Cavalry" title="Cavalry">Cavalry</a></li></ul></li>
<li><a href="Artillery" title="Artillery">Artillery</a></li>
<li><a href="Special_forces" title="Special forces">Special forces</a></li>
<li><a href="Signal_corps" title="Signal corps">Signal corps</a></li></ul>
<hr>
<ul><li><i>Naval units:</i></li>
<li><a href="Warship" title="Warship">Warships</a></li>
<li><a href="Submarine" title="Submarine">Submarines</a></li>
<li><a href="Aircraft_carrier" title="Aircraft carrier">Aircraft carriers</a></li>
<li><a href="Landing_craft" title="Landing craft">Landing craft</a></li>
<li><a href="Auxiliary_ship" title="Auxiliary ship">Auxiliary ships</a></li></ul>
<hr>
<ul><li><i>Air units:</i></li>
<li><a href="Fighter_aircraft" title="Fighter aircraft">Fighters</a></li>
<li><a href="Bomber" title="Bomber">Bombers</a></li>
<li><a href="Airborne_early_warning_and_control" title="Airborne early warning and control">Command</a></li>
<li><a href="Close_air_support" title="Close air support">Close air support</a></li>
<li><a href="Electronic-warfare_aircraft" title="Electronic-warfare aircraft">Electronic-warfare</a></li>
<li><a href="Reconnaissance_aircraft" title="Reconnaissance aircraft">Reconnaissance</a></li></ul>
<hr>
<ul><li><i>Combat systems:</i></li>
<li><a href="Fire-control_system" title="Fire-control system">Fire-control system</a></li>
<li><a href="Fire-control_radar" title="Fire-control radar">Fire-control radar</a></li>
<li><a href="Director_(military)" title="Director (military)">Director (military)</a></li>
<li><a href="Combat_information_center" title="Combat information center">Combat information center</a></li>
<li><a href="Sonar" title="Sonar">Sonar</a></li>
<li><a href="Radar" title="Radar">Radar</a></li></ul>
<hr>
<ul><li><i>Historical:</i></li>
<li><a href="Ship_gun_fire-control_system" title="Ship gun fire-control system">Ship gun fire-control</a></li>
<li><a href="Gun_data_computer" title="Gun data computer">Gun data computer</a></li>
<li><a href="Torpedo_Data_Computer" title="Torpedo Data Computer">Torpedo data computer</a></li></ul>
<hr>
<ul><li><i>Development:</i></li>
<li><a href="Basic_training" class="mw-redirect" title="Basic training">Basic training</a></li>
<li><a href="Military_exercise" title="Military exercise">Military manoeuvrers</a></li>
<li><a href="Combat_training" class="mw-redirect" title="Combat training">Combat training</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Battlespace" title="Battlespace">Battlespace</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Aerospace" title="Aerospace">Aerospace</a>
<ul><li><a href="Aerial_warfare" title="Aerial warfare">Aerial</a></li>
<li><a href="Airborne_forces" title="Airborne forces">Airborne</a></li>
<li><a href="Space_warfare" title="Space warfare">Space</a></li></ul></li></ul>
<hr>
<ul><li><a href="Land_warfare" title="Land warfare">Land</a>
<ul><li><a href="Cold-weather_warfare" title="Cold-weather warfare">Cold-region</a></li>
<li><a href="Desert_warfare" title="Desert warfare">Desert</a></li>
<li><a href="Fortification" title="Fortification">Fortification</a></li>
<li><a href="Jungle_warfare" title="Jungle warfare">Jungle</a></li>
<li><a href="Mountain_warfare" title="Mountain warfare">Mountain</a></li>
<li><a href="Urban_warfare" title="Urban warfare">Urban</a></li>
<li><a href="Subterranean_warfare" title="Subterranean warfare">Subterranean</a>
<ul><li><a href="Tunnel_warfare" title="Tunnel warfare">Tunnel</a></li></ul></li></ul></li></ul>
<hr>
<ul><li><a href="Naval_warfare" title="Naval warfare">Sea</a>
<ul><li><a href="Amphibious_warfare" title="Amphibious warfare">Amphibious</a></li>
<li><a href="Blue-water_navy" title="Blue-water navy">Blue</a></li>
<li><a href="Brown-water_navy" title="Brown-water navy">Brown</a></li>
<li><a href="Green-water_navy" title="Green-water navy">Green</a></li>
<li><a href="Surface_warfare" title="Surface warfare">Surface</a></li>
<li><a href="Underwater_warfare" title="Underwater warfare">Underwater</a>
<ul><li><a href="Seabed_warfare" title="Seabed warfare">Seabed</a></li></ul></li></ul></li></ul>
<hr>
<ul><li><a href="Cyberwarfare" title="Cyberwarfare">Cyber</a></li>
<li><a href="Information_warfare" title="Information warfare">Information</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Weapon" title="Weapon">Weapons</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Anti-aircraft_warfare" title="Anti-aircraft warfare">Air defence</a></li>
<li><a href="Armoured_warfare" title="Armoured warfare">Armor</a></li>
<li><a href="Artillery" title="Artillery">Artillery</a></li>
<li><a href="Barrage_(artillery)" title="Barrage (artillery)">Barrage</a></li>
<li><a href="Biological_warfare" title="Biological warfare">Biological</a></li>
<li><a href="Military_camouflage" title="Military camouflage">Camouflage</a></li>
<li><a href="Cavalry" title="Cavalry">Cavalry</a>
<ul><li><a href="Horses_in_warfare" title="Horses in warfare">Horses</a></li>
<li><a href="Cavalry_tactics#Cavalry_in_modern_warfare" title="Cavalry tactics">Air cavalry</a></li></ul></li>
<li><a href="Chemical_warfare" title="Chemical warfare">Chemical</a></li>
<li><a href="Combined_arms" title="Combined arms">Combined arms</a></li>
<li><a href="Conventional_warfare" title="Conventional warfare">Conventional</a></li>
<li><a href="Cyberweapon" title="Cyberweapon">Cyber</a></li>
<li><a href="Area_denial_weapon" title="Area denial weapon">Denial</a></li>
<li><a href="Disinformation" title="Disinformation">Disinformation</a></li>
<li><a href="Drone_warfare" title="Drone warfare">Drone</a> / <a href="Military_robot" title="Military robot">Robot</a></li>
<li><a href="Electromagnetic_warfare" class="mw-redirect" title="Electromagnetic warfare">Electromagnetic</a></li>
<li><a href="Firearm" title="Firearm">Firearms</a></li>
<li><a href="Infantry" title="Infantry">Infantry</a></li>
<li><a href="Loitering_munition" title="Loitering munition">Loitering</a></li>
<li><a href="Missile_defense" title="Missile defense">Missile</a></li>
<li><a href="Martial_music" title="Martial music">Music</a></li>
<li><a href="Nuclear_warfare" title="Nuclear warfare">Nuclear</a></li>
<li><a href="Psychological_warfare" title="Psychological warfare">Psychological</a></li>
<li><a href="Radiological_warfare" title="Radiological warfare">Radiological</a></li>
<li><a href="Submarine_warfare" title="Submarine warfare">Submarine</a></li>
<li><a href="Unconventional_warfare" title="Unconventional warfare">Unconventional</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military_tactics" title="Military tactics">Tactics</a></div><div class="sidebar-list-content mw-collapsible-content"><a href="List_of_military_tactics" title="List of military tactics">List of military tactics</a>
<ul><li><a href="Air_combat_manoeuvring" title="Air combat manoeuvring">Aerial</a></li>
<li><a href="Airlift" title="Airlift">Airlift</a>
<ul><li><a href="Air_assault" title="Air assault">Air assault</a></li>
<li><a href="Airbridge_(logistics)" title="Airbridge (logistics)">Airbridge</a></li>
<li><a href="Airdrop" title="Airdrop">Airdrop</a></li></ul></li>
<li><a href="Anti-aircraft_warfare" title="Anti-aircraft warfare">Anti-aircraft</a></li>
<li><a href="Anti-submarine_warfare" title="Anti-submarine warfare">Anti-sub</a></li>
<li><a href="Anti-tank_warfare" title="Anti-tank warfare">Anti-tank</a></li>
<li><a href="Battle" title="Battle">Battle</a></li>
<li><a href="Cavalry_tactics" title="Cavalry tactics">Cavalry</a></li>
<li><a href="Charge_(warfare)" title="Charge (warfare)">Charge</a></li>
<li><a href="Close-quarters_battle" title="Close-quarters battle">CQC</a></li>
<li><a href="Counterattack" title="Counterattack">Counterattack</a></li>
<li><a href="Counterinsurgency" title="Counterinsurgency">Counterinsurgency</a></li>
<li><a href="Convoy" title="Convoy">Convoy</a></li>
<li><a href="Defeat_in_detail" title="Defeat in detail">Defeat in detail</a></li>
<li><a href="Defensive_fighting_position" title="Defensive fighting position">Foxhole</a></li>
<li><a href="Drone_warfare" title="Drone warfare">Drone</a></li>
<li><a href="Envelopment" title="Envelopment">Envelopment</a></li>
<li><a href="Tactical_formation" title="Tactical formation">Formation</a></li>
<li><a href="Guerrilla_warfare" title="Guerrilla warfare">Guerrilla</a></li>
<li><a href="Naval_tactics" title="Naval tactics">Naval</a></li>
<li><a href="Shock_and_awe" title="Shock and awe">Rapid dominance</a></li>
<li><a href="Encirclement" title="Encirclement">Encirclement</a></li>
<li><a href="Investment_(military)" title="Investment (military)">Investment</a>
<ul><li><a href="Siege" title="Siege">Siege</a></li></ul></li>
<li><a href="Swarming_(military)" title="Swarming (military)">Swarm</a></li>
<li><a href="Screening_(tactical)" title="Screening (tactical)">Screen</a></li>
<li><a href="Tactical_objective" title="Tactical objective">Tactical objective</a></li>
<li><a href="Saturation_attack" title="Saturation attack">Target saturation</a></li>
<li><a href="Trench_warfare" title="Trench warfare">Trench</a></li>
<li><a href="Withdrawal_(military)" title="Withdrawal (military)">Withdrawal</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Operational_level_of_war" title="Operational level of war">Operational</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Military_operation" title="Military operation">Military operation</a>
<ul><li><a href="Special_operations" title="Special operations">Special</a></li></ul></li>
<li><a href="Operations_research" title="Operations research">Operations research</a></li>
<li><i><a href="Blitzkrieg" title="Blitzkrieg">Blitzkrieg</a></i></li>
<li><a href="Expeditionary_warfare" title="Expeditionary warfare">Expeditionary</a></li>
<li><a href="Deep_operation" title="Deep operation">Deep operation</a></li>
<li><a href="Maneuver_warfare" title="Maneuver warfare">Maneuver</a></li>
<li><a href="Operational_manoeuvre_group" title="Operational manoeuvre group">Operational manoeuvre group</a></li>
<li><a href="Raid_(military)" title="Raid (military)">Raid</a></li>
<li><a href="Covert_operation" title="Covert operation">Covert</a></li>
<li><a href="Stay-behind" title="Stay-behind">Stay-behind</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military_strategy" title="Military strategy">Strategy</a></div><div class="sidebar-list-content mw-collapsible-content"><a href="List_of_military_strategies_and_concepts" title="List of military strategies and concepts">List of military strategies and concepts</a>
<ul><li><a href="Military_campaign" title="Military campaign">Military campaign</a></li>
<li><a href="Anti-access/area_denial" title="Anti-access/area denial">Anti-access</a></li>
<li><a href="Attrition_warfare" title="Attrition warfare">Attrition</a></li>
<li><a href="Commerce_raiding" title="Commerce raiding">Commerce raiding</a></li>
<li><a href="Counter-offensive" class="mw-redirect" title="Counter-offensive">Counter-offensive</a></li>
<li><a href="Culminating_point" title="Culminating point">Culminating</a></li>
<li><a href="Defence_in_depth" title="Defence in depth">Defence in depth</a></li>
<li><a href="Fabian_strategy" title="Fabian strategy">Fabian</a></li>
<li><a href="Empty_Fort_Strategy" title="Empty Fort Strategy">Empty fort</a></li>
<li><a href="Mosaic_Warfare" class="mw-redirect" title="Mosaic Warfare">Mosaic</a></li>
<li><a href="Military_deception" title="Military deception">Deception</a></li>
<li><a href="Strategic_defence" title="Strategic defence">Defensive</a></li>
<li><a href="Strategic_depth" title="Strategic depth">Depth</a></li>
<li><a href="Strategic_goal_(military)" title="Strategic goal (military)">Goal</a></li>
<li><a href="Nuclear_strategy" title="Nuclear strategy">Nuclear</a></li>
<li><a href="Naval_strategy" title="Naval strategy">Naval</a></li>
<li><a href="Offensive_(military)" title="Offensive (military)">Offensive</a></li>
<li><a href="Scorched_earth" title="Scorched earth">Scorched earth</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Grand_strategy" title="Grand strategy">Grand strategy</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Asymmetric_warfare" title="Asymmetric warfare">Asymmetric</a></li>
<li><a href="Blockade" title="Blockade">Blockade</a></li>
<li><a href="Broken-backed_war_theory" title="Broken-backed war theory">Broken-backed</a></li>
<li><a href="Class_conflict" class="mw-redirect" title="Class conflict">Class</a></li>
<li><a href="Cold_war_(general_term)" class="mw-redirect" title="Cold war (general term)">Cold war</a></li>
<li><a href="Colonial_war" title="Colonial war">Colonial</a></li>
<li><a href="Conquest" title="Conquest">Conquest</a></li>
<li><a href="Containment" title="Containment">Containment</a></li>
<li><a href="Divide_and_rule" class="mw-redirect" title="Divide and rule">Divide and conquer</a></li>
<li><a href="Economic_warfare" title="Economic warfare">Economic</a></li>
<li><a href="Endemic_warfare" class="mw-redirect" title="Endemic warfare">Endemic</a></li>
<li><a href="Fleet_in_being" title="Fleet in being">Fleet in being</a></li>
<li><a href="Irregular_warfare" title="Irregular warfare">Irregular</a></li>
<li><a href="Wars_of_national_liberation" title="Wars of national liberation">Liberation</a></li>
<li><a href="Limited_war" title="Limited war">Limited</a></li>
<li><a href="Network-centric_warfare" title="Network-centric warfare">Network-centric</a></li>
<li><a href="New_generation_warfare" title="New generation warfare">New generation</a></li>
<li><a href="Perpetual_war" title="Perpetual war">Perpetual</a></li>
<li><a href="Political_warfare" title="Political warfare">Political</a></li>
<li><a href="Princely_rebellion" title="Princely rebellion">Princely</a></li>
<li><a href="Proxy_war" title="Proxy war">Proxy</a></li>
<li><a href="Religious_war" title="Religious war">Religious</a></li>
<li><a href="Resource_war" title="Resource war">Resource</a></li>
<li><a href="Strategic_studies" title="Strategic studies">Strategic</a></li>
<li><a href="War_of_succession" title="War of succession">Succession</a></li>
<li><a href="Military_technology" title="Military technology">Technology</a></li>
<li><a href="Theater_(warfare)" title="Theater (warfare)">Theater</a></li>
<li><a href="Total_war" title="Total war">Total war</a></li>
<li><a href="World_war" title="World war">World war</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military_administration" title="Military administration">Administrative</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Military_branch" title="Military branch">Branch</a></li>
<li><a href="Military_policy" title="Military policy">Policy</a></li>
<li><a href="Staff_(military)" title="Staff (military)">Staff</a></li>
<li><a href="Military_education_and_training" title="Military education and training">Training</a></li>
<li><a href="Military_service" title="Military service">Service</a></li>
<li><a href="Military_sociology" title="Military sociology">Sociology</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military_organization" title="Military organization">Organization</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Area_of_responsibility" title="Area of responsibility">Area of responsibility</a></li>
<li><a href="Command_hierarchy" title="Command hierarchy">Chain of command</a></li>
<li><a href="Command_and_control" title="Command and control">Command and control</a></li>
<li><a href="Military_doctrine" title="Military doctrine">Doctrine</a></li>
<li><a href="Order_of_battle" title="Order of battle">Order of battle</a></li>
<li><a href="Principles_of_war" title="Principles of war">Principles of war</a></li>
<li><a href="Economy_of_force" title="Economy of force">Economy of force</a></li>
<li><a href="Military_medicine" title="Military medicine">Medicine</a></li>
<li><a href="Military_engineering" title="Military engineering">Engineers</a></li>
<li><a href="Military_intelligence" title="Military intelligence">Intelligence</a></li>
<li><a href="Military_rank" title="Military rank">Ranks</a></li>
<li><a href="Military_technology" title="Military technology">Technology and equipment</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military_personnel" title="Military personnel">Personnel</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Military_recruitment" title="Military recruitment">Recruitment</a></li>
<li><a href="Conscription" title="Conscription">Conscription</a></li>
<li><a href="Draft_evasion" title="Draft evasion">Draft evasion</a></li>
<li><a href="Mobilization" title="Mobilization">Mobilization</a></li>
<li><a href="Recruit_training" class="mw-redirect" title="Recruit training">Training</a></li>
<li><a href="Military_specialism" title="Military specialism">Specialism</a></li>
<li><a href="Soldier" title="Soldier">Soldier</a></li>
<li><a href="Morale" title="Morale">Morale</a></li>
<li><a href="Military_volunteer" title="Military volunteer">Volunteer</a></li>
<li><a href="Women_in_the_military" title="Women in the military">Women</a></li>
<li><a href="Children_in_the_military" title="Children in the military">Children</a></li>
<li><a href="Transgender_people_and_military_service" title="Transgender people and military service">Transgender</a></li>
<li><a href="Sexual_harassment_in_the_military" title="Sexual harassment in the military">Harassment</a></li>
<li><a href="Conscientious_objector" title="Conscientious objector">Conscientious objector</a></li>
<li><a href="Conscription_and_sexism" title="Conscription and sexism">Conscription and sexism</a></li>
<li><a href="Counter-recruitment" title="Counter-recruitment">Counter-recruitment</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military_logistics" title="Military logistics">Logistics</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="History_of_military_logistics" title="History of military logistics">History</a></li>
<li><a href="War_economy" title="War economy">War economy</a></li>
<li><a href="Arms_industry" title="Arms industry">Arms industry</a></li>
<li><a href="Materiel" title="Materiel">Materiel</a></li>
<li><a href="Military_supply-chain_management" title="Military supply-chain management">Supply-chain management</a></li>
<li><a href="Military%E2%80%93industrial_complex" title="Military–industrial complex">Military–industrial complex</a></li>
<li><a href="Military_base" title="Military base">Base</a>
<ul><li><a href="Main_operating_base" title="Main operating base">MOB</a></li>
<li><a href="Forward_operating_base" title="Forward operating base">FOB</a></li>
<li><a href="Outpost_(military)" title="Outpost (military)">Outpost</a></li></ul></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military_science" title="Military science">Science</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Power_projection" title="Power projection">Power projection</a></li>
<li><a href="Loss-of-strength_gradient" title="Loss-of-strength gradient">Loss-of-strength gradient</a></li>
<li><a href="Lanchester's_laws" title="Lanchester's laws">Lanchester's laws</a>
<ul><li><a href="Force_multiplication" title="Force multiplication">Force multiplication</a></li></ul></li>
<li><a href="Morale" title="Morale">Morale</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Law_of_war" title="Law of war">Law</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Belligerent" title="Belligerent">Belligerent</a></li>
<li><a href="Military_occupation" title="Military occupation">Occupation</a></li>
<li><a href="Armistice" title="Armistice">Armistice</a></li>
<li><a href="Ceasefire" title="Ceasefire">Ceasefire</a></li>
<li><a href="Court-martial" title="Court-martial">Court-martial</a></li>
<li><a href="Desertion" title="Desertion">Desertion</a></li>
<li><a href="Geneva_Conventions" title="Geneva Conventions">Geneva Conventions</a></li>
<li><a href="Geneva_Protocol" title="Geneva Protocol">Geneva Protocol</a></li>
<li><a href="Islamic_military_jurisprudence" title="Islamic military jurisprudence">Islamic rules</a></li>
<li><a href="Military_justice" title="Military justice">Justice</a></li>
<li><a href="Combatant" title="Combatant">Lawful</a> / <a href="Unlawful_combatant" title="Unlawful combatant">Unlawful combatant</a></li>
<li><a href="Perfidy" title="Perfidy">Perfidy</a></li>
<li><a href="Regular_army" title="Regular army">Regular</a> / <a href="Irregular_military" title="Irregular military">Irregular</a></li>
<li><a href="Jewish_laws_on_war" class="mw-redirect" title="Jewish laws on war">Jewish laws on war</a></li>
<li><a href="Right_of_conquest" title="Right of conquest">Right of conquest</a></li>
<li><a href="Self-defence_in_international_law" title="Self-defence in international law">Right of self-defence</a></li>
<li><a href="Rules_of_engagement" title="Rules of engagement">Rules of engagement</a></li>
<li><a href="Self-determination" title="Self-determination">Self-determination</a></li>
<li><a href="Martial_law" title="Martial law">Martial law</a></li>
<li><a href="War_crime" title="War crime">War crime</a></li>
<li><a href="War_and_genocide" title="War and genocide">War and genocide</a></li>
<li><a href="War_treason" title="War treason">War treason</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military_theory" title="Military theory">Theory</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Air_supremacy" title="Air supremacy">Air supremacy</a></li>
<li><a href="Appeasement" title="Appeasement">Appeasement</a></li>
<li><a href="Command_of_the_sea" title="Command of the sea">Command of the sea</a></li>
<li><a href="Deterrence_theory" title="Deterrence theory">Deterrence theory</a></li>
<li><a href="Full-spectrum_dominance" title="Full-spectrum dominance">Full-spectrum dominance</a></li>
<li><a href="Overmatch" title="Overmatch">Overmatch</a></li>
<li><a href="Just_war_theory" title="Just war theory">Just war theory</a></li>
<li><a href="Principles_of_war" title="Principles of war">Principles of war</a></li>
<li><a href="Philosophy_of_war" title="Philosophy of war">Philosophy of war</a></li>
<li><a href="Security_dilemma" title="Security dilemma">Security dilemma</a>
<ul><li><a href="Tripwire_force" title="Tripwire force">Tripwire force</a></li></ul></li>
<li><a href="Professional_wargaming" title="Professional wargaming">Wargaming</a>
<ul><li><a href="Military_simulation" title="Military simulation">Simulation</a></li>
<li><a href="Military_exercise" title="Military exercise">Exercises</a></li></ul></li>
<li><a href="Combat_effectiveness" title="Combat effectiveness">Combat effectiveness</a></li>
<li><a href="Center_of_gravity_(military)" title="Center of gravity (military)">Center of gravity</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military_operations_other_than_war" title="Military operations other than war">Non-warfare</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Arms_control" title="Arms control">Arms control</a></li>
<li><a href="Counter-insurgency" class="mw-redirect" title="Counter-insurgency">Counter-insurgency</a></li>
<li><a href="Deterrence_theory" title="Deterrence theory">Deterrence</a></li>
<li><a href="Disaster_response" title="Disaster response">Disaster response</a></li>
<li><a href="Grey-zone_(international_relations)" title="Grey-zone (international relations)">Grey-zone</a></li>
<li><a href="Gunboat_diplomacy" title="Gunboat diplomacy">Gunboat diplomacy</a></li>
<li><a href="Humanitarian_aid" title="Humanitarian aid">Humanitarian aid</a></li>
<li><a href="Law_enforcement" title="Law enforcement">Law enforcement</a></li>
<li><a href="Low-intensity_conflict" title="Low-intensity conflict">Low-intensity conflict</a></li>
<li><a href="Military_engineering" title="Military engineering">Military engineering</a></li>
<li><a href="Peacekeeping" title="Peacekeeping">Peacekeeping</a>
<ul><li><a href="Peacebuilding" title="Peacebuilding">Peacebuilding</a></li>
<li><a href="Peace_through_strength" title="Peace through strength">Peace through strength</a></li></ul></li>
<li><a href="Show_of_force" title="Show of force">Show of force</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)"><a href="Military_tradition" title="Military tradition">Culture</a></div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Military_awards_and_decorations" title="Military awards and decorations">Awards and decorations</a></li>
<li><a href="Battle_cry" title="Battle cry">Battle cry</a></li>
<li><a href="Warrior" title="Warrior">Warrior</a></li>
<li><a href="War_film" title="War film">War film</a></li>
<li><a href="Military_science_fiction" title="Military science fiction">Military science fiction</a></li>
<li><a href="War_novel" title="War novel">War novel</a></li>
<li><a href="Anti-war_movement" title="Anti-war movement">Anti-war movement</a></li>
<li><a href="Foot_drill" title="Foot drill">Foot drill</a></li>
<li><a href="War_song" title="War song">War song</a></li>
<li><a href="Military_uniform" title="Military uniform">Uniform</a></li>
<li><a href="Wargame" title="Wargame">Wargame</a></li>
<li><a href="Militarization" title="Militarization">Militarization</a> / <a href="Militarism" title="Militarism">Militarism</a>
<ul><li><a href="Antimilitarism" title="Antimilitarism">Antimilitarism</a></li></ul></li>
<li><a href="Camp_follower" title="Camp follower">Camp follower</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)">Books</div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Seven_Military_Classics" title="Seven Military Classics">Seven Military Classics</a>
<ul><li><a href="The_Art_of_War" title="The Art of War">The Art of War</a></li></ul></li>
<li><a href="De_re_militari" title="De re militari">De re militari</a></li>
<li><a href="Strategemata" title="Strategemata">Strategemata</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)">Related</div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Women_in_war" title="Women in war">Women in war</a></li>
<li><a href="War_resister" title="War resister">War resister</a></li>
<li><a href="War_studies" title="War studies">War studies</a></li>
<li><a href="Horses_in_warfare" title="Horses in warfare">Horses in warfare</a></li>
<li><a href="Wartime_sexual_violence" title="Wartime sexual violence">Wartime sexual violence</a></li>
<li><a href="Fifth_column" title="Fifth column">Fifth column</a></li>
<li><a href="Mercenary" title="Mercenary">Mercenary</a></li>
<li><a href="Pacifism" title="Pacifism">Pacifism</a></li>
<li><a href="Privateer" title="Privateer">Privateer</a></li>
<li><a href="Private_military_company" title="Private military company">Private military company</a></li>
<li><a href="Soldiers_are_murderers" title="Soldiers are murderers">Soldiers are murderers</a></li></ul></div></div></td>
</tr><tr><td class="sidebar-content">
<div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;;color: var(--color-base)">Lists</div><div class="sidebar-list-content mw-collapsible-content">
<ul><li><a href="Lists_of_battles" title="Lists of battles">Battles</a></li>
<li><a href="List_of_military_occupations" title="List of military occupations">Military occupations</a></li>
<li><a href="List_of_established_military_terms" title="List of established military terms">Military terms</a></li>
<li><a href="List_of_military_operations" title="List of military operations">Operations</a></li>
<li><a href="List_of_sieges" title="List of sieges">Sieges</a></li>
<li><a href="List_of_war_crimes" title="List of war crimes">War crimes</a></li>
<li><a href="Outline_of_war#Wars" title="Outline of war">Wars</a></li>
<li><a href="Lists_of_weapons" title="Lists of weapons">Weapons</a></li>
<li><a href="List_of_military_writers" title="List of military writers">Writers</a></li></ul></div></div></td>
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<p>
An <b>undeclared war</b> is a <a href="War" title="War">military conflict</a> between two or more nations without either side issuing a formal <a href="Declaration_of_war" title="Declaration of war">declaration of war</a>. The term is sometimes used to include any disagreement or conflict fought about without an official declaration. Since the <a href="United_Nations" title="United Nations">United Nations</a>' <a href="Police_action" title="Police action">police action</a> in the <a href="Korean_War" title="Korean War">Korean War</a>,<sup id="cite_ref-Truman1950_1-0" class="reference"><a href="#cite_note-Truman1950-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> some governments have pursued disciplinary actions and limited warfare by characterizing them as something else such as a military action or armed response.
</p><p>Under <a href="Customary_international_law" title="Customary international law">customary international law</a>, it is not necessary to declare war—simply beginning hostilities is sufficient to make belligerent intentions clear.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="United_States">United States</h2></div>
<div role="note" class="hatnote navigation-not-searchable">Further information: <a href="Declaration_of_war_by_the_United_States" title="Declaration of war by the United States">Declaration of war by the United States</a></div>
<p>There is no specific format required under United States law for the way an official war declaration will be structured or delivered. The United States Constitution states: "The Congress shall have Power […] To <a href="Declaration_of_war" title="Declaration of war">declare War</a>, grant <a href="Letter_of_marque" title="Letter of marque">Letters of Marque and Reprisal</a>, and make <a href="Prize_court" title="Prize court">Rules concerning Captures on Land and Water</a>".<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>
</p><p>As of September 2024, the <a href="United_States_Congress" title="United States Congress">United States Congress</a> has formally declared war 11 times, and has not done so since 1942; 6 of these were WWII declarations.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> The United States did not declare war during its <a href="Vietnam_War" title="Vietnam War">involvement in Vietnam</a>, although the <a href="Gulf_of_Tonkin_Resolution" title="Gulf of Tonkin Resolution">Gulf of Tonkin Resolution</a> authorized the escalation and use of military force in the Vietnam War without a formal declaration of war.<sup id="cite_ref-tws28sep07_5-0" class="reference"><a href="#cite_note-tws28sep07-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> On at least 125 occasions a US president has employed military forces without authorization from Congress.<sup id="cite_ref-:0_6-0" class="reference"><a href="#cite_note-:0-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> One of the most significant of these occasions was the <a href="Korean_War" title="Korean War">Korean War</a>, where the United States led a peacekeeping <a href="United_Nations" title="United Nations">United Nations</a> force to stop North Korea's invasion against South Korea. The conflict resulted in over 142,000 American casualties (about 40,000 deaths and over 100,000 injuries).<sup id="cite_ref-:0_6-1" class="reference"><a href="#cite_note-:0-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="Russia">Russia</h2></div>
<p>No formal declaration of war has been issued in the ongoing <a href="Russo-Ukrainian_War" title="Russo-Ukrainian War">Russo-Ukrainian War</a>. When the Russian president, <a href="Vladimir_Putin" title="Vladimir Putin">Vladimir Putin</a>, launched the full-scale <a href="Russian_invasion_of_Ukraine" title="Russian invasion of Ukraine">invasion of Ukraine</a> in 2022, he used the euphemistic phrase '<a href="On_conducting_a_special_military_operation" title="On conducting a special military operation">special military operation</a>.'<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="Other_examples">Other examples</h2></div>
<p>The <a href="Falklands_War" title="Falklands War">Falklands War</a> between <a href="Argentina" title="Argentina">Argentina</a> and the <a href="United_Kingdom" title="United Kingdom">United Kingdom</a> (April–June 1982) was never formally declared as a war.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Proxy_war" title="Proxy war">Proxy war</a></li>
<li><a href="Police_action" title="Police action">Police Action</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-Truman1950-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-Truman1950_1-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">
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</style><cite id="CITEREFTruman1950" class="citation web cs1">Truman, Harry S. (29 June 1950). <a rel="nofollow" class="external text" href="http://teachingamericanhistory.org/library/index.asp?document=594">"The President's News Conference of June 29, 1950"</a>. Teachingamericanhistory.org<span class="reference-accessdate">. Retrieved <span class="nowrap">4 January</span> 2011</span>.</cite></span>
</li>
<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://casebook.icrc.org/a_to_z/glossary/declaration-war">"Declaration of war"</a>. <i>International Committee of the Red Cross</i><span class="reference-accessdate">. Retrieved <span class="nowrap">9 February</span> 2024</span>.</cite></span>
</li>
<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://usconstitution.net/xconst_A1Sec8.html">"U.S. Constitution - Article 1 Section 8"</a>.</span>
</li>
<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite id="CITEREFFranke-Ruta2019" class="citation web cs1">Franke-Ruta, Garance (31 August 2019). <a rel="nofollow" class="external text" href="https://www.theatlantic.com/politics/archive/2013/08/all-the-previous-declarations-of-war/279246/">"All the Previous Declarations of War"</a>. <i>The Atlantic</i><span class="reference-accessdate">. Retrieved <span class="nowrap">1 September</span> 2019</span>.</cite></span>
</li>
<li id="cite_note-tws28sep07-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-tws28sep07_5-0">^</a></b></span> <span class="reference-text"><cite class="citation news cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20080107101712/http://www.time.com/time/magazine/article/0,9171,878290,00.html">"The Law: The President's War Powers"</a>. <i>Time</i>. 1 June 1970. Archived from <a rel="nofollow" class="external text" href="http://www.time.com/time/magazine/article/0,9171,878290,00.html">the original</a> on 7 January 2008<span class="reference-accessdate">. Retrieved <span class="nowrap">28 September</span> 2009</span>.</cite></span>
</li>
<li id="cite_note-:0-6"><span class="mw-cite-backlink">^ <a href="#cite_ref-:0_6-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:0_6-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite id="CITEREFYooDelahunty2002" class="citation journal cs1">Yoo, John C.; Delahunty, Robert J. (2002). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20190426071815/https://scholarship.law.berkeley.edu/cgi/viewcontent.cgi?article=1570&amp;context=facpubs">"The President's Constitutional Authority to Conduct Military Operations Against Terrorist Organizations and the Nations that Harbor or Support Them"</a>. <i>SSRN Working Paper Series</i>: 502. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.2139%2Fssrn.331202">10.2139/ssrn.331202</a>. <a href="ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a>&nbsp;<a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/1556-5068">1556-5068</a>. Archived from <a rel="nofollow" class="external text" href="https://scholarship.law.berkeley.edu/cgi/viewcontent.cgi?article=1570&amp;context=facpubs">the original</a> on 26 April 2019<span class="reference-accessdate">. Retrieved <span class="nowrap">14 January</span> 2020</span>.</cite></span>
</li>
<li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://theconversation.com/putins-ukraine-invasion-do-declarations-of-war-still-exist-177880">Putin's Ukraine invasion - do declarations of war still exist?</a>, R. Pullen, C. Frost, The Conversation, March 3, 2022]</span>
</li>
<li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.iwm.org.uk/history/a-short-history-of-the-falklands-conflict">"A Short History of the Falklands Conflict"</a>. <i>Imperial War Museums</i><span class="reference-accessdate">. Retrieved <span class="nowrap">25 February</span> 2024</span>.</cite></span>
</li>
</ol></div></div>
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