During the First World War, the corps reached its apogee both in size and experience. The two people in charge of the RAMC in the Great War were Arthur Sloggett, the senior RAMC officer seconded to the IYH in Deelfontein who acquiesced in all Fripp's surprising innovations, and Alfred Keogh, whom Fripp recommended to Brodrick as an RAMC man well-regarded when Registrar of No.3 General Hospital in Cape Town. Its main base was for long the Queen Alexandra Military Hospital at Millbank, London (now closed). It set up a network of military general hospitals around the United Kingdom and established clinics and hospitals in countries where there were British troops. Major-General Sir William Macpherson of the RAMC wrote the official "Medical History of the War" (HMSO 1922).