The 2nd Cohort of the Imperial VII Legion is garrisoned in Osis for the purposes of defending the city from outside threats, but most often the 2nd Cohort instead patrols the Imperial Highways looking for bandits and monstrous threats. They can also be called on in times of civil unrest, but nobody likes when that happens. Not the Lord Mayor, not the Centurion, not the legionaries, and certainly not the people the legion is unleashed against. The 2nd Cohort numbers 100 legionaries as well as another 150 or so auxiliaries.
The Lord Mayor of Osis has no command over the 2nd Cohort. The most he can do is to directly appeal to the Centurion or up to the Lord Baron (who can issue orders to the Legion). This has lead to no small bit of tension and even the occasional violent episode in the past, but currently there are no real problems between the Legion and the Lord Mayor’s Office.