As acting Commanding Officer of the 2nd Armoured Battalion Irish Guards, he served under his cousin Brigadier Joe Vandeleur (their grandfathers were brothers) in the breakout of XXX Corps during Operation Market-Garden.
Serving as acting Commanding Officer of the 2nd Armored Battalion Irish Guards, he worked alongside his cousin, Brigadier Joe Vandeleur, who was also related to him through their grandfathers being brothers, during the breakout of XXX Corps during Operation Market-Garden.