Operation Chess was a British Commando raid during the Second World War. It was carried out by 17 men of No. 12 Commando commanded by a Second Lieutenant Pinckney over the night of 27/28 July 1941.The target for the raid was Ambleteuse, Pas-de-Calais, France. The raiding party were towed across the English Channel in two Landing Craft by a Motor Launch. Which cast them off two miles from the Slack River near Ambleteuse. They remained ashore for one hour, no prisoners were taken.Cdr.