Question: Donald Swain Lewis, was a Lieutenant Colonel in the British Army and was the second highest-ranked officer in the Royal Flying Corps/Royal Air Force to be killed in action in the First World War, his father was Ernest Lewis, one of the founding directors of the Army & Navy Stores, was a department store group in which country?
Sentence (from "Archibald MacLean"): In April 1918 he transferred to the newly formed Royal Air Force and was subsequently promoted to brigadier general just after the end of the First World War.
Relevant evidence: No