 In 1915 during the First World War he was a member of the House of Commons' 'Ammunition Committee', established by David Lloyd George as Minister of Munitions.Benn moved to represent Plymouth Drake in 1918, and in the Birthday Honours that year was appointed to the Order of the British Empire as a Knight Commander (KBE).In 1921, he became the President of the Association of British Chambers of Commerce, a position he held until 1923, and also became the Chair of the National Unionist Association.