At the outbreak of the First World War he rejoined the British Army as a second lieutenant in the Queen's Own Oxfordshire Hussars on 26 August 1914.[3] On 1 December 1914 he was given a temporary promotion to captain.[4] He was granted the permanent rank of captain on 21 January 1916.[5]
After the war, he represented the All Ireland Polo Club in their 1922 visit to the USA.[6]