From the National Firearms Association of Canada:

Sarcastically referred to as the “Woolworth Gun”, the Liberator Pistol’s actual name was the “Flare Projector” Caliber .45 (FP-45). A single-shot pistol, the Liberator was designed to be scattered about occupied Europe to be used by Resistance groups as disposable assassination weapons or to enable resisters to kill a German soldier and then take his weapon.

According to the Wikipedia entry the guns were never actually used in combat and most were destroyed at the end of the war. It was probably the only pistol made that took longer to make than to load (6 second to make, 10 to load).

[tags]Liberator, Guns, .45 of the Week[/tags]