Portal:World War II/Featured article/8

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German battleship Schleswig-Holstein, shelling Westerplatte, September 1, 1939.

The Invasion of Poland, 1939 which precipitated World War II, was carried out by Nazi Germany, the Soviet Union and a small German-allied Slovak contingent.The invasion of Poland marked the start of World War II in Europe, as Poland's western allies, the United Kingdom, Australia and New Zealand, declared war on Germany on September 3, soon followed by France, South Africa and Canada, among others. The invasion began on September 1, 1939, one week after the signing of the Molotov-Ribbentrop Pact, and ended October 6, 1939, with Germany and the Soviet Union occupying the entirety of Poland. Although the United Kingdom and France declared war on Germany soon after Germany attacked Poland, very little direct military aid was provided (see Phoney War and Western betrayal). Following a German-staged "Polish attack" on August 31, 1939, on September 1, German forces invaded Poland from the north, south, and west. Spread thin defending their long borders, the Polish armies were soon forced to withdraw eastward.