Normandy
XV Corps took part in the July, 1944 breakout from Normandy (Operation Cobra). The corps liberated Le Mans on 8 August 1944. In a controversial decision by the Twelfth United States Army Group commander, Lieutenant General Omar Bradley, the corps was halted at Argentan on 13 August 1944, before it effected juncture with Canadian troops, allowing Germans trapped in the Falaise Pocket an escape route to the east. Seizing a bridgehead over the Seine River on 20 August 1944, the corps then mopped up German resistance along the west bank of the river. Subsequently, the corps had no divisions assigned to it and used its corps troops to screen the southern flank of the U.S. XII Corps.
Read more about this topic: XV Corps (United States)