decury

noun

1. (Ancient-Rome)A group of ten men under the command of a decurion.

   “Accordingly, the hundred senators divided the government among themselves, ten decuries being formed, and the individual members who were to have the chief direction of affairs being chosen into each decury.”

   “If one, two, or more of a decury proceed bravely to battle, and the rest do not follow, the cowards are slain.”