What was a group of 5,000 legionaries called

A legion was made up of around 5000 legionaries and was commanded by a legate. Each legion was further divided into smaller groups of around 80 legionaries, called centuries and led by a centurion.

Explanation:

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china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.

i see, would you mind putting it as one?