World War Two in Europe began on 3rd September 1939, when the Prime Minister of Britain, Neville Chamberlain, declared war on Germany. The War ended in the Summer of 1945. World War II was the most destructive conflict in history. It cost more money, damaged more property, killed more people, and caused more far-reaching changes than any other war in history. Between 1939 and 1945, the Allies dropped 3.4 million tons of bombs, which averaged to 27,700 tons per month. It is estimated that 50 million people lost their lives during World War 2.