'Guard' in the Bible

When he arrested Peter, Herod put him in prison and turned him over to four squads of soldiers to guard him, planning to bring him out to the people after Passover season.

They passed the first guard, then the second, and came to the iron gate that led into the city. It opened by itself for them, and they went outside and proceeded one block when the angel suddenly left him.

This man had been seized by the Jews and was about to be killed by them when I went with the guard and rescued him, having learned that he was a Roman citizen.

He ordered the centurion to guard Paul but to let him have some freedom and not to keep any of his friends from caring for his needs.