Note:  Do not rely on this information. It is very old.


Decimation (Latin decimus, tenth), the killing of every tenth man (usually drawn by lot) in a regiment or military division guilty collectively of some grave offence, e.g. mutiny. The practice is a Roman invention, said to have been revived by Crassus (q.v.) after long discontinuance. Instances are known under the Roman Empire, and it has been occasionally resorted to in modern times.