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