When Nazi Germany annexed the Reichskommissariat of Belgium and Northern France on the 15 December 1944, no part of the planned Reichsgau Wallonia was under German control. During the Battle of the Bulge, all territory east of the Western Front within Belgium (excluding Bastogne) became part of the Reichsgau Wallonia. The most populous municipality held by the Germans within the Reichsgau Wallonia was Rochefort.