'Cohort' in the Bible

Now there was a man at Caesarea named Cornelius, a centurion of what was called the Italian cohort,

The crowd was trying to kill Paul when a report reached the tribune of the cohort that all Jerusalem was in an uproar.

When it was decided that we would sail for Italy, they proceeded to deliver Paul and some other prisoners to a centurion of the Augustan cohort named Julius.