Serjeant Leslie Alfred Barker died on 26 October 1944 in Nispen, Noord-Brabant, Netherlands, when he was just 29 years old. Whilst awaiting support of Clarkeforce infantry troops, his reconnaissance vehicle of the A Squadron 49th Reconnaissance Regiment was hit at the crossroads of Bergsebaan and Rietgoorsestraat. From the crew Luitenant M. Dobson was wounded; whilst Soldiers John Walker and Arthur Rouse and Serjeant Leslie Barker were killed instantly.

As Walker, Rouse and Barker where one of the first victims to fall during the liberation of Nispen, their names were put on the Memoriam board. According to the coördinates of the graves registration report from the CWGC, they were buried to the NORTH of Nispen, on the crossroads of Bergesbaan and Kozijnstraat and then reburied in the cemetery of Bergen op Zoom.