Jan Christiaan Smuts, OM, CH, ED, KC, FRS, PC (24 May 1870 – 11 September 1950) was a prominent South African and British Commonwealth statesman, military leader and philosopher. In addition to holding various cabinet posts, he served as Prime Minister of the Union of South Africa from 1919 until 1924 and from 1939 until 1948. He served in the First World War and as a British field marshal in the Second World War. He led commandos in the Second Boer War for the Transvaal. During the First World War, he led the armies of South Africa against Germany, capturing German South-West Africa and commanding the British Army in East Africa. From 1917 to 1919, he was also one of five members of the British War Cabinet, helping to create the Royal Air Force. He became a field marshal in the British Army in 1941, and served in the Imperial War Cabinet under Winston Churchill. He was the only person to sign the peace treaties ending both the First and Second World Wars.