Europe 1939: Invasion of Poland
The signing of the Molotov–Ribbentrop Pact in August 1939 removed the threat from the Soviet Union, allowing Hitler to invade Poland on 1 September. Two days later, Britain and France declared war on Germany. The Second World War had begun.
1 Sep 1939 Germany invasion of Poland▲
Using several German-staged incidents as casus belli, Nazi Germany struck Wieluń, Poland, with the Luftwaffe at 04:40 on 1 September 1939 - the first blow of World War II. Five minutes later, the German battleship Schleswig-Holstein opened fire on a Polish military transit depot in the Free City of Danzig, with Germany launching an all out attack on Poland's northern, western, and southern borders later that day.
3 Sep 1939 Declaration of War on Germany▲
Responding to the German invasion of Poland, France and the United Kingdom declared war on Germany. The official Declaration of war by France and the United Kingdom was read out by the British Prime Minister Neville Chamberlain, in Westminster, London, on behalf of both countries. Although the declaration fulfilled the two powers' guarantees to Poland, moves of practical support were limited.