In Britain, women also worked in gathering intelligence , at Bletchley Park and other places. The mass evacuation of children also had a major impact on the lives of mothers during the war years.
Germany had two different ideas of how it would occupy countries. The Nazis used their racial policy and murdered a lot of people they thought non-human. The Resistance, the group of people who fought Germany secretly, could not harm the Nazis much until In Asia, Japan claimed to free colonised Asian countries from European colonial powers. By , it was able to produce up to 50 million barrels of oil in the Dutch East Indies. The war brought new methods for future wars. The air forces improved greatly in fields such as air transport,  strategic bombing to use bombs to destroy industry and morale ,  as well as radar , and weapons for destroying aircraft.
Jet aircraft were developed and would be used in worldwide air forces. At sea, the war focused on using aircraft carriers and submarines.
Aircraft carriers soon replaced battleships. The British improved weapons for destroying submarines, such as sonar , while the Germans improved submarine tactics. The style of war on the land changed from World War I to be more moveable. Tanks , which were used to support infantry , changed to a primary weapon. At the start of the war, most commanders thought that using better tanks was the best way to fight enemy tanks.
The German idea to avoid letting tanks fight one another meant tanks facing tanks rarely happened. This was a successful tactic used in Poland and France. Even though vehicles became more used in the war, infantry remained the main part of the army,  and most equipped like in World War I. Submachine guns became widely used.
They were especially used in cities and jungles. Other developments included better encryption for secret messages, such as the German Enigma. Another feature of military intelligence was the use of deception , especially by the Allies. Others include the first programmable computers , modern missiles and rockets , and the atomic bombs. From Wikipedia, the free encyclopedia. World War II From top left to bottom right: Commonwealth army in the desert ; Japanese troops burying a Chinese person alive; A German submarine under attack; Soviet forces in the Eastern Front; Soviet troops fighting in Berlin ; Japanese planes readying for take off from an aircraft carrier.
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The Air War at Sea. Concepts in Submarine Design. The Reader's Companion to Military History. Citations, with minimal bibliographic information, are gathered together by chapter at the end. The focus of the book is quite naturally and legitimately on the military background and the waging of the war. The political background is not neglected, though the approach is, not unexpectedly, fairly orthodox. There is some discussion from a military point of view of the Chamberlain policy of appeasement of if not collusion with Hitler, prior to the assault on Poland.
But there is little recognition of the origins of the war in the fundamental rupture of the European imperialist order which followed the Bolshevik revolution of After unsuccessful attempts by Western states including Canada to strangle the new regime at birth for two decades, anti-communism emerged as major though not always openly proclaimed determinant of foreign policy.
By trade and diplomatic means the Soviet state was effectively isolated from the world community. Not until did the Soviet Union gain membership in the League of Nations, where the Foreign Minister, Litvinov, fought for disarmament and collective security. He also tried to stop the fascist takeover of Republican Spain in the bitterly fought civil war in which Franco received decisive military support from his allies, Hitler and Mussolini.
Such an outcome was a very real possibility, narrowly averted. Had it happened, a very different history would have been written today.