Career
Henderson began World War I as an army private, in the London Scottish battalion, but was commissioned into the Seaforth Highlanders in 1915 and seconded to the Royal Flying Corps. In 1916 he was awarded the Defence Science Organisation. The citation read:
Later that year the French government awarded him the Croix de guerre. In the 1920s he spent some years in Egypt, commanding first 216 Squadron (with DH10 aircraft) and then 47 Squadron (with DH9As).
He was Air Officer Commanding Number.
14 (Fighter) Group during the Battle of Britain.
