Stiletto the Allied side, the French Lebel M1886 épée (needle sword) bayonet was frequently cut down and converted into a stiletto or thrusting knife ("Poignard-Baïonnette Lebel"). These weapons were used to eliminate sentries in trench raids as well as for personal defense. As a class, these daggers, knives, and stilettos were given the title trench knife. World War II saw a resurgence of the stiletto in the form of combat knives for commando raiding forces and other troops who needed a weapon for silent killing. In late 1940, the famed British hand-to-hand combat instructors William E. Fairbairn and Eric A. Sykes
Stiletto fallen or severely wounded heavily armored opponent. The needle-like blade could, if used with sufficient force, penetrate most mail or find its way through gaps in a knight's plate armor, and was narrow enough to pass through the eye slits of the helmeted knight. A severely wounded opponent who was not expected to survive would be given a "mercy strike" (French "coup de grâce"), hence the name "miséricorde". Later, the Gunner's Stiletto became a tool for clearing cannon-fuse touch holes; used in the manner of an automotive oil dipstick, they were often inscribed with marks indicating levels of powder charges