'Cohort' in the Bible

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

While they were seeking to kill him, a report came up to the commander of the Roman cohort that all Jerusalem was in confusion.

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.