Military history of South Africa (One of them, John Vorster, was to become future Prime Minister of South Africa.) (See Jan Smuts during World War II.) Prime Minister Jan Smuts was the only important non-British general whose advice was constantly sought by Britain's war-time Prime Minister Winston Churchill. Smuts was invited to the Imperial War Cabinet in 1939 as the most senior South African in favour of war. On 28 May 1941, Smuts was appointed a Field Marshal of the British Army, becoming the first South African to hold that rank. Ultimately, Smuts would pay a steep political price for his closeness to the British
Prime Minister of Australia becomes acting Prime Minister in those circumstances. Three Prime Ministers have died in office – Joseph Lyons (1939), John Curtin (1945) and Harold Holt (1967). In each of these cases, the Deputy Prime Minister (an unofficial office at the time) became an interim Prime Minister, pending an election of a new leader of the government party. In none of these cases was the interim Prime Minister successful at the subsequent election. As of , there are seven living former Australian Prime Ministers. The greatest number of living former Prime Ministers at any one time was eight. This has occurred twice: