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
Heel-shaped cairn Heel-shaped cairn The heel-shaped cairn, with its usually cruciform chamber, is a type of megalithic monument that is found in Scotland, especially in Caithness and Sutherland and on the Shetland Islands. On Orkney, the Isbister Cairn is the only site that is similar in shape. The chambers usually lie in a round cairn made of broken rocks, which either contemporaneously or later were surrounded by the eponymous platform, up to 20 metres wide at the front and from 1.0 to 1.5 metres high, and were partly enclosed by large kerbstones. A gentle concave exedra is characteristic of the front face.