In late June Cassels was given command of the 152nd Infantry Brigade, part of the veteran 51st (Highland) Infantry Division, then fighting in Normandy after having landed there earlier in the month shortly after D-Day on 6 June.
In late June Cassels was given command of the 152nd Infantry Brigade, one of three brigades forming part of the veteran 51st (Highland) Infantry Division--the others being 153rd and 154th. The division was then fighting in Normandy after having landed there earlier in the month shortly after D-Day on 6 June.