When US forces arrived in 1942, the city handed the new hospital facilities over to the Americans, as a sort of reverse Lend-Lease. The initial units of the Medical Corps were the 2nd and 77th Evacuation Hospitals and the 152nd Station Hospital. Further expansion to the facilities including 27 wards, occurred in late 1942 and it was occupied by the 298th General Hospital. Initially, the Americans used the hospital mainly as training facility for their medical staff. After D-Day, however, the hospital was used in earnest, under the control of the 100th and then 117th General Hospitals. Casualties were flown into Filton or arrived by train from the channel ports. Between 5 August and 31 December 1944 a total of 4,954 patients were discharged from Frenchay.