Atkey enlisted into the
British Army, joining the 2/24th Battalion,
London Regiment, a
Territorial Force unit that was stationed in England until sent to France in June 1916. On 19 October Atkey was
commissioned as a
second lieutenant (on probation) in the
Royal Flying Corps, and was confirmed in his rank in September 1917. He was then posted to
No. 18 Squadron to fly the
Airco DH.4 day bomber. He and his gunners claimed nine victories between 4 February and 21 April 1918. He was then transferred to
No. 22 Squadron to fly the
Bristol F.2b fighter/reconnaissance aircraft in "A" Flight, paired with Lieutenant
Charles George Gass as his gunner/observer. On 7 May Atkey and Gass took part in an historic dogfight north-east of
Arras, known as the "Two Against Twenty", when Atkey and Gass, with
John Gurdon and Anthony Thornton, fought twenty German scout aircraft. Atkey and Gass shot down five enemy aircraft while Gurdon and Thornton accounted for three. Two days later, Atkey and Gass again shot down five enemy aircraft in a single day. Atkey claimed a further 19 aircraft between 15 May and 2 June, ==Post-war life==