September 2, British Prime Minister Neville Chamberlain and French Prime Minister Édouard Daladier issued a joint ultimatum to Germany, demanding the withdraw of troops from Poland within 12 hours.
September 3, British Prime Minsiter Neville Chamberlain announced over radio that because Germany had failed to withdraw troops from Poland by 1100 hours, a state of war now existed between the United Kingdom and Germany. (sep 2, 1939 – sep 3, 1939)