John Hartley was a Flying Officer in the Royal Air Force Volunteer Reserve (271 Squadron.) He was the son of William and Violet and they lived in Stoke Poges. He died, aged 22, on September 21st 1944. He is buried in Adegem Canadian War Cemetery in Belgium.
In the last week of September 1944, the Allies held the city of Antwerp, but the Germans held both shores of the Scheldt estuary, so that the port of Antwerp could not be used. The task of clearing the southern shore of the estuary was allotted to the 3rd Canadian Division, aided by the 4th Canadian Armoured Division and the 52nd Division. Their operations lasted from October until the beginning of November 1944; by 3 November the Germans had been cleared from the north-west corner of Belgium and the south shore of the Scheldt was free. There had been fierce fighting for two weeks for the crossing of the Leopold Canal.
His listing with the CWGC can be found here.