On 3 September 1939, Prime Minister Menzies announced Australia's declaration of war on Nazi Germany. Australia had entered World War II, following the Nazi invasion of Poland. The Labor Party declined to enter a war cabinet led by Menzies, though Curtin offered co-operation – though not to the extent of supporting conscription for overseas service. The Labor Party experienced a split along pro and anti Communist lines over policy towards the Soviet Union for its co-operation with Nazi Germany in the invasion of Poland and Labor narrowly lost the September 1940 Election. The Menzies Government relied upon the support of two Independents, Alex Wilson and Arthur Coles to continue in office.