"Change of Expression", undated pencil drawing:
"A King and his Queen":
Excerpt from the Wikipedia article (much the same, although a bit less detailed story is given in "Masters..."):
On the hot and stuffy 18th July his tank, after crossing a railway line, drove over some felled telegraph wires beside the railway, which became entangled in its tracks. He and the crew got out to free the tank from the wire when a German machine gunner opened fire on them, preventing them from getting back into their tank. Whistler dashed across an open space of 60 yards to another tank to instruct its commander, a Sergeant Lewis Sherlock, to return the fire. As he climbed down from Sherlock's tank a mortar bomb exploded beside him and killed him instantly, throwing him into the air. He was the first fatality suffered by the Battalion in the Normandy Campaign.