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World War II, or the Second World War, was a global military conflict. It began as the joining of what had initially been two separate conflicts, with the first beginning in Asia in 1937 (the Second Sino-Japanese War) and the other beginning in Europe in 1939 (the German and Soviet invasion of Poland).

The war split the majority of the world's nations into two opposing military alliances: the Allies and the Axis. It involved the mobilization of over 100 million military personnel, making it the most widespread war in history, and placed the participants in a state of "total war", which erased the distinction between civil and military resources and resulted in the complete activation of a nation's economic, industrial, and scientific capabilities for the purposes of the war effort. Over 70 million people, the majority of them civilians, were killed, making it the deadliest conflict in human history.

The Allies won the war, and as a result, the Soviet Union and the United States emerged as the world's leading superpowers. This set the stage for the Cold War, which lasted for the next 45 years. The United Nations was formed in the hope of preventing another such conflict. The self-determination spawned by the war accelerated decolonization movements in Asia and Africa, while Europe itself began moving toward integration.

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Carlson's patrol, also known as The Long Patrol or Carlson's long patrol, was an operation by the 2nd Marine Raider Battalion under the command of Evans Carlson during the Guadalcanal Campaign against the Imperial Japanese Army from November 6 to December 4, 1942. In the operation, the 2nd Raiders attacked forces under the command of Toshinari Shōji, which were escaping from an attempted encirclement in the Koli Point area on Guadalcanal and attempting to rejoin other Japanese army units on the opposite side of the U.S. Lunga perimeter.In a series of small unit engagements over 29 days, the 2nd Raiders killed almost 500 Japanese soldiers while suffering only 16 killed. The raiders also captured a Japanese artillery cannon that was delivering harassing gunfire on Henderson Field, the Allied airfield at Lunga Point on Guadalcanal.On August 7, 1942, Allied forces (primarily US Marines) landed on Guadalcanal, Tulagi, and Florida Islands in the Solomon Islands. Their mission was to deny the Japanese use of the islands as bases for threatening the supply routes between the U.S. and Australia, and to secure the islands as starting points for a campaign to isolate the major Japanese base at Rabaul while also supporting the Allied New Guinea campaign. The landings initiated the six-month-long Guadalcanal Campaign.
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The armament of the Iowa-class battleships has undergone a massive evolution since the first Iowa-class ship was laid down in June of 1940; The Iowas remain among the most heavily-armed ships the United States ever put to sea. The main battery of 16-inch (406 mm) guns could hit targets nearly 24 miles (39 km) away with a variety of artillery shells, from standard armor piercing rounds to tactical nuclear charges called "Katies" (from "kt" for kiloton).The secondary battery of 5-inch (127 mm) guns could hit targets nearly 9 miles (14 km) away with solid projectiles or proximity fused shells, and were equally adept in an anti-aircraft role and for damaging smaller ships. When commissioned these battleships carried a fearsome array of 20 mm and 40 mm anti-aircraft guns, which were gradually replaced with Tomahawk and Harpoon missiles, Phalanx anti-aircraft/anti-missile Gatling gun systems, and electronic warfare suites. By the time the last Iowa-class battleship was decommissioned in 1992, the Iowas had set a new record for battleship weaponry: no other battleship class in history has had so many weapons at its disposal for use against an opponent.
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The Battle of Greece (also known as Operation Marita, was a World War II battle that occurred on the Greek mainland and in southern Albania. The battle was fought between the Allied (Greece and the British Commonwealth) and Axis (Nazi Germany, Fascist Italy and Bulgaria) forces. With the Battle of Crete and several naval actions, the Battle of Greece is considered part of the wider Aegean component of the Balkan Campaign of World War II. The Battle of Greece is generally regarded as a continuation of the Greco-Italian War, which began when Italian troops invaded Greece on October 28, 1940. Within weeks the Italians were driven from Greece and Greek forces pushed on to occupy much of southern Albania. In March 1941, a major Italian counterattack failed, and Germany was forced to come to the aid of its ally. Operation Marita began on April 6, 1941, with German troops invading Greece through Bulgaria in an effort to secure its southern flank. The combined Greek and British forces fought back with great tenacity, but were vastly outnumbered and outgunned, and finally collapsed. Athens fell on April 27.
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Credit: Alfred T. Palmer
A real-life Rosie the Riveter working on the A-31 Vengeance bomber in Nashville, Tennessee.
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Franklin Delano Roosevelt often referred to by his initials FDR, was the thirty-second President of the United States. Elected to four terms in office, he served from 1933 to 1945 and is the only U.S. president to have served more than two terms. He was a central figure of the 20th century during a time of worldwide economic crisis and world war. During the Great Depression of the 1930s, Roosevelt created the New Deal to provide relief for the unemployed, recovery of the economy, and reform of the economic and banking systems. Although recovery of the economy was incomplete until almost 1940, the programs he initiated such as the Federal Deposit Insurance Corporation (FDIC), Tennessee Valley Authority (TVA), and the United States Securities and Exchange Commission (SEC) continue to have instrumental roles in the nation's commerce. One of his most important legacies is the Social Security system. As Britain warred with Nazi Germany, Roosevelt provided Lend-Lease aid to Winston Churchill and the British war effort before America's entry into World War II in December, 1941.
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"This morning the British Ambassador in Berlin handed the German Government a final note, stating that, unless we heard from them by 11 o'clock that they were prepared at once to withdraw their troops from Poland, a state of war would exist between us. I have to tell you now that no such undertaking has been received and that consequently this country is at war with Germany."
Neville Chamberlain, 3 September 1939

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World War II
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1939
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1940
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1941
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1942
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1943
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1944
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1945
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Blitzkrieg
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The Allies
Australia Australia
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Canada Canada
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Kingdom of Egypt Egypt
El Salvador El Salvador
French Third Republic France (after June 16, 1940: Free France Free France)
Kingdom of Greece Greece
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Dominion of New Zealand New Zealand
Norway Norway
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Poland Poland
Republic of China (1912–1949) Republic of China
Union of South Africa South Africa
Soviet Union Soviet Union
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United States United States
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The Axis
Kingdom of Bulgaria Bulgaria
 Croatia
Empire of Japan Japan
Finland Finland
 Vichy France
Kingdom of Hungary (1920–1946) Hungary
Kingdom of Italy Italy
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From the World War II task force of the Military history WikiProject:

Attention needed
...to referencing and citation  • ...to coverage and accuracy  • ...to structure  • ...to grammar  • ...to supporting materials 
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Battle of Kiev (1943)Battle of Ko ChangColditz CastleSpiritual national defenceTuskegee Airmen
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Battle of Uhtua-Kiestinki • Battles of Repola-Rukajärvi • Battle of Siiranmäki • Battle of Łuck • Battle of Równe • Battle of Włodzimierz Wołyński • Battle of Lubartów • Battle of Miedniki • Battle of Jodła • Francis Blanchain • Shinshou Draenger • Christer Lyst Hansen • Ove Kampman • League for Combat Policy • Julien Meline • Operation Bigot • Operation Mittelmeer • Operation Richard • Otto Program • Martin Poppel • Roehm's Avengers • Dorothy Tartiere • Poul Bruun • Raoul Boulanger • Serge Asher-Ravanel • Battle of West Ukraine (1941) • Battle of Zunyi • Liberation of Denmark (currently redirect) • Operation Vado (currently redirect) • Finnish 19th Division (Continuation War) • Finnish 11th Division (Continuation War) • Finnish VII Corps (Continuation War) • Finnish Cavalry Brigade • 1st Jaeger Brigade • 2nd Jaeger Brigade • 168th Rifle Division (Soviet Union) • 71st Rifle Division (Soviet Union) • Group Oinonen • Operation Vesuvius (currently redirect) • Capture of Kassala (currently redirect) • Liberation of Lille • Battle of Pankow • Brandenburg–Rathenow Offensive • Japanese internment of European civilians during World War II • Miranda de Ebro concentration camp • The Holocaust in the Netherlands (current redirect) • German occupation of the Netherlands (current redirect) • Axis occupation of Monaco • Soviet home front during World War II • Labour Charter (Vichy France) • Berles-Monchel and Aubigny-en-Artois massacres (1940) • Febvin-Palfart massacre (1940) • German massacres of French colonial prisoners of war • 1941 Nord-Pas de Calais miners' strike • Spitfire funds • Good War (historiography) • Nederlandsche Oost Compagnie
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Princess Irene BrigadeBattle of Bay of ViipuriDemilitarisationFree Dutch ForcesMartha DesrumeauxMochitsura HashimotoOperation CascadeOperation Tan No. 2Burma Area ArmyBattle of CourlandBattle of Munda PointBattle of Voronezh (1943)Drive on Munda PointFirst Battle of KharkovRace to BerlinMarie FourcadeVictor Strydonck de BurkelDonald BlakesleeOperation NordwindBattle of Skerki BankMichael Sinclair (soldier)Battle of MaastrichtBattle of ZeelandLandings on RendovaNew Georgia counterattackOperation WaterfallPetsamo–Kirkenes OffensiveAmerican-British-Dutch-Australian CommandBattle of Viru HarborBattle of Wickham AnchorageWestern New Guinea campaign (and the individual battles of the campaign) • Operation BlockbusterOperation CooneyThe Holocaust in FranceKnowledge of the Holocaust in Nazi Germany and German-occupied EuropeFrancoist Spain and the HolocaustJapan campaignVolcano and Ryukyu Islands campaignmore
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Twelfth Army (United Kingdom)4th Airborne Division (United Kingdom)5th Airborne Division (United Kingdom)XVI Corps (United Kingdom)Battle of DakarBattle of the Lys (1940)Battle of ZeelandBattle of the GrebbebergFranco-Thai WarBattle of Ko ChangSwitzerland during the World WarsBerthe FraserWestern Allied invasion of GermanyLXXXIII Army Corps (Wehrmacht)
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Battle of Borneo (1941–42)Battle of ImphalGarderegiment Fuseliers Prinses IreneJapanese invasion of French IndochinaJapanese invasion of ThailandLuxembourg in World War IINew Georgia CampaignOperation CartwheelOperation ChastiseRoyal Netherlands Motorized Infantry BrigadeSolomon Islands campaignBattle of RadomSeishin OperationMoravia–Ostrava OffensivePanzerjäger
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5th Guards Fighter Aviation Regiment [ru] • Novorossiysk-Taman Operation [ru] • 1943 Novorossiysk Operation [ru] • 1943 Air Battles over Kuban [ru] • Battle of Rostov (1943) [ru] • Battle of Olshansky [ru] • Nalchik-Ordzhonikidzevskaya Operation [ru] • Bukrinsky Landing [ru] • Cape Tarhan Landing [ru] • 1942 Sudak Landing [ru] • Mozdok-Malgobek Operation [ru] • Alexander Sergeyevich Ksenofontov [ru] • Henri de Vernejoul [fr] • André Bergeret [fr] • Battle of Nice [fr] • Liberation de Saint-Malo [fr] • Battle of Seuil Valley [fr] • René-Jean-Paul Cassagne [fr] • Cameroun's rallying to the Free French [fr] • Battle of Bouno-Misaki [ja]

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