The XXV Army Corps was established as a reserve command staff in the Upper Rhine border region in 1938.
This staff was mobilized as Generalkommando Oberrhein on 26 August 1939 and renamed XXV Army Corps on 17 September 1939.
[2] On 30 October 1943, Wilhelm Fahrmbacher received the German Cross in Silver for his service as the commander of XXV Army Corps.
[3] The units of the XXV Army Corps were pushed into the Atlantic pockets at Brest, Lorient and Saint-Nazaire in August 1944 as a result of the Allied breakthrough from southwestern Normandy into Brittany (Operation Cobra).
[5] In total, the American force that pushed through the far end of the Allied right flank included four armored and eight infantry divisions.
Furthermore, a southward push by the 4th U.S. Armored Division from Rennes towards Saint-Nazaire and Nantes began on 3 August with the goal of cutting Brittany off any Axis reinforcements.
[5] Subsequently, the American siege units were content with allowing most of the German garrisons to remain in their pockets; only Brest and Saint-Malo fell under heavy immediate attack.