https://en.wikipedia.org/wiki/Decimation_%28Roman_army%29

"A cohort (roughly 480 soldiers) selected for punishment by decimation was divided into groups of ten. Each group drew lots (sortition), and the soldier on whom the lot fell was executed by his nine comrades, often by stoning or clubbing."

"The procedure was a pragmatic attempt to balance the need to punish serious offences with the realities of managing a large group of offenders."