What was a group of Roman soldiers called?

The generic Word for a soldier is "miles". However, Latin can be a very specific language and here are some adjectives that went along with the "miles" to indicate what soldier was being indicated. A "miles gregarius" was a common soldier, a private. A "miles pedes" was a foot soldier. and a "miles eques" was a horse soldier/cavalryman. A buddy, or a fellow soldier was a "miles commilito". If a man were in the marine corps he would be a "miles classicus".