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German crossing of the Soviet border, violating the Neutrality pact between the two countries and creating another front in the war. Ended in 1942 due to the harsh Russian winters.
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A naval battle between Japan and American forces, resulting in a draw due to high casualties on both sides but ultimately prevented a Japanese invasion of Australia.
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A turning point in the War of the Pacific, where American forces surprised Japanese forces during their refueling and sunk four Japanese Aircraft carriers, dealing a massive blow.
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The Red Army made a stand in the city of Stalingrad, a major industrial center that the Germans were trying to take. During the next winter spell, the German forces were forced to surrender due to the expertise of fighting by the Red Army in 1943.
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Invasion of Italy began with the island invasion of Sicily by American and British forces, resulting in the downfall of the Italian Government from a lack of faith in their leader.
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The invasion of Normandy, the largest naval invasion used by the allies to gain a foothold and enter the war in Europe.
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A German counterattack that resulted in a push back of Allied forces, bending but not breaking the line. Many casualties on both sides.