From Wikipida:
"On another occasion Macpherson took decisive action as the Second Motorised SS Infantry Division and the Das Reich Division pushed towards the fragile Normandy beach-head. Unarmed and accompanied by a doctor and a French officer, he drove a stolen German Red Cross Land Rover through ten miles of enemy-held territory, through machine gun fire and straight to the Das Reich Division headquarters where, dressed in full Highland regalia, he warned that he would unleash heavy artillery and call on the RAF if they did not surrender. In consequence, 23,000 German troops surrendered. It was a bluff
I would hate to play poker with him.