[1] Lewis was commissioned from cadet to temporary second lieutenant (on probation) in the Royal West Kent Regiment on 5 August 1916.
On the afternoon of 27 July, with pilot Second Lieutenant G. T. Burkett, Lewis destroyed two more Albatros D.Vs over Menen, but was severely wounded by an incendiary bullet.
[5] His citation, published on 10 January 1918, read: Lewis was promoted to lieutenant on 5 February 1918,[7] but ceased to be an observer on 30 May,[8] serving as an administrative officer.
[9] Lewis retained his interest in aviation post-war being one of the founders of the Cinque Ports Flying Club, based at Lympne Aerodrome, Kent, in 1928.
[10] He returned to military service during World War II, being commissioned as a probationary acting pilot officer "for the duration of hostilities" in the Royal Air Force Volunteer Reserve's Training Branch on 2 February 1941,[11] until resigning his commission on 24 April 1942.