Question: Which country was Pilot Officer Sydney "Timberoes" Carlin fighting against while serving as air gunner?
Sentence (from "Sydney Carlin (RAF officer)"): Pilot Officer Sydney "Timbertoes" Carlin, {'1': ", '2': ", '3': ", '4': "} (1889–1941) was a British World War I flying ace, despite having previously lost a leg during the Battle of the Somme.
Relevant evidence: Yes