IV Squadron reformed on 30 April 1920 at Farnborough, equipped with Bristol F.2 Fighters. Part of the squadron moved to Aldergrove near Belfast in November 1920 as a result of the Irish War of Independence, moving to Baldonnel Aerodrome near Dublin in May 1921, before rejoining the rest of the squadron at Farnborough in January 1922. The squadron deployed on Royal Navy aircraft carriers when they sailed to Turkey on HMS "Ark Royal" and "Argus" during the Chanak crisis in August 1922, returning to Farnborough in September 1923. When the 1926 General Strike broke out, IV Squadron's aircraft were used to patrol railway lines to deter feared sabotage.