 After being seriously wounded in action at Shabqadar on 15 September 1915, Maybery became bored during his rehabilitation and, unable to sit on a horse, became involved in observing for a unit of the Royal Flying Corps who were based nearby.He was eventually seconded to the RFC, and appointed a flying officer (observer) on 10 October 1916, with seniority from 21 August 1916.Later he travelled to Egypt where he trained to be a pilot, being appointed a flying officer on 11 April 1917, and was posted to France to serve in No.