Military history of South Africa during World War II September 1939, Britain declared war on Germany two days later. A short but furious debate unfolded in South Africa, especially in the halls of power in the Parliament of South Africa. It pitted those who sought to enter the war on Britain's side, led by Smuts, against those who wanted to keep South Africa neutral, led by Hertzog. On 4 September 1939, the United Party caucus refused to accept Hertzog's stance of neutrality in World War II and deposed him in favour of Smuts. Upon becoming Prime Minister, Smuts declared South Africa officially at war with Germany and the Axis.
Minister for Co-ordination of Defence Inskip provoked widespread astonishment. A famous remark was "This is the most cynical appointment since Caligula made his horse a consul". The appointment is now regarded as a sign of caution by Baldwin, who did not wish to appoint someone like Churchill who would have been interpreted by foreign powers as a sign of the United Kingdom preparing for war, as well as a desire to avoid taking on board a controversial and radical minister. In 1939 Inskip was succeeded by First Sea Lord Lord Chatfield. When the Second World War broke out, the new Prime Minister Neville Chamberlain formed