 During the Battle of the Bulge , Horrocks was temporarily relieved of his command of XXX Corps by Field Marshal Montgomery and sent back to England to rest . Montgomery had taken this move because Horrocks had become " nervy and difficult with his staff " and had " attempted to act foolishly " with XXX Corps . The corps was temporarily commanded by Major @-@ General Gwilym Ivor Thomas , GOC 43rd ( Wessex ) Infantry Division . 
