Educated at Cheltenham College, Walter was commissioned into the 12th Regiment of Foot on 14 January 1880.[1] He became Deputy Assistant Adjutant-General in India in May 1896, and saw action with the Tochi Field Force and then at the Relief of Ladysmith in October 1899 during the Second Boer War.[1] He became Assistant Adjutant-General in October 1910 and Deputy Adjutant-General at GHQ India in September 1913.[1]