The "Frundsberg" was sent to the Normandy to attempt to halt the advance of Field Marshal Bernard Montgomery's 21st Army Group, currently advancing on Caen. Deisenhofer's unit saw action during Operation Epsom, which resulted in German defeat. In mid July, Deisenhofer was ordered back east to take command of the SS Division Wiking, currently engaged in heavy fighting in the area near Modlin. At the end of August, he took over command of the 17th SS Panzergrenadier Division Götz von Berlichingen. Near the end of January, Deisenhofer disappeared when traveling to a new command post. He was classified as missing in action.