During WWII in North Africa, German soldiers in the Afrika Korps referred to the British they fought against as Tommies. By late 1942 the introduction of the Panzer V or "Tiger I" changed the battlefield. The Tiger was able to destroy all British- and later American- tanks in a single shot. German troops then began to refer to the tank as a Tommy Cooker.
"Did you hear about that battle near Kasserine Pass? Man, those Tommy Cookers made short order of the American positions."