During the Dambuster Raids Royal Air Force missions in May 1943, the RAF Bomber Command's No. 5 Group and operation HQ were in St Vincents, a building later owned by Aveling-Barford and housing a district council planning department. It was built by Richard Hornsby in 1865 and lived in by his son. It is now a private house. In 1944 (including D-Day), it was the headquarters for the USAAF's Ninth Air Force's IX Troop Carrier Command, known as Grantham Lodge.