Who Commanded a Cohort in an Imperial Legion?

[Crispvs]

I have read suggestions (although I do not believe they are based on any ancient source) that a century's artillery piece might have been the responsibility of a particular contabernium, who would have been responsible for crewing and maintaining the machine. Although it is a modern theory, if this sort of thing might actually have been the case, one might imagine that other contabernia might have had specialities as well, in which case a commander wanting particular specialist troops for a particular campaign might strip a legion of all the soldiers with those particular specialities to include them in his force, which would therefore lead to men from all centuries in the legion being included in the vexillation. Just an idea.

Crispvs