Henry Mainwaring in the King's cause in the English Civil War, was exiled to France, and died in poverty. He was buried at St. Giles' Church, Camberwell, London, on 15 May 1653. Mainwaring married a daughter of Sir Thomas Gardiner in 1630. She died in 1633. His brothers were Sir Arthur Mainwaring, Carver to Prince Henry, George Mainwaring, the defender of Tong Castle, and Sir Thomas Mainwaring, the Recorder of Reading. The Mainwaring family was old and distinguished, probably having arrived in England in the train of William the Conqueror (1066). Henry Mainwaring Sir Henry Mainwaring (1587–1653), was an English lawyer, soldier,
Captain Mainwaring set in 1968, Mainwaring, who was born in 1885, would have been 82 years old then and 60 at the end of the Second World War. In a radio sequel to "Dad's Army", "It Sticks Out Half a Mile", which is set in 1948 (three years after the Second World War ended), it is revealed that Mainwaring spent two years manufacturing cuckoo clocks in Switzerland. However, the first episode of "Dad's Army" shines light on Mainwaring's future: briefly set in the then present-day 1968, it features Mainwaring as guest of honour at the launch of Walmington's "I'm Backing Britain" campaign,