The only active unit after October 1944 was IV. "Gruppe", which continued operations in the west from 1940 to 1945. It was initially formed as "Ergänzungsstaffel" at Chatres, France on 1 April 1940, its earliest known designation being "Ausbildungsstaffel" at Ulm-Dornstadt. On 30 September 1940 the group transferred to Landsberg. By 8 March it had expanded into IV.(Erg)/KG 55, with 10 and 11 "Staffeln". On 7 April 12 "Staffel" was added at Longvic near Dijon, France. From March 1941–May 1944 it was involved in night attacks on Britain and training.