This unit - 1 Bucks Battalion (Oxfordshire and Buckinghamshire Light Infantry) - participated with the Normandy Landings on June 6th 1944. According to the postion on the map you can see where the unit probably has landed on one of the five landing beaches or inland as a paratrooper or in a glider.
If you have more information about the 1 Bucks Battalion (Oxfordshire and Buckinghamshire Light Infantry), please contact WW2 History Europe