While overlooking Jerusalem, the Antonia Fortress was garrisoned with 600 Roman soldiers, who watched over the Temple courts in order to preserve order. The Bible spoke about the Antonia Fortress as a barracks (Acts 21:37), and it was here that Paul gave an address to the people (22:1-21). Paul was held in the fortress in protective custody until a military escort took him to Caesarea (Acts 23:12-24,31-35).
Acts 21:32-36
Then the commander came near and took him, and commanded him to be bound with two chains; and he asked who he was and what he had done. And some among the multitude cried one thing and some another. So when he could not ascertain the truth because of the tumult, he commanded him to be taken into the barracks. When he reached the stairs, he had to be carried by the soldiers because of the violence of the mob. For the multitude of the people followed after, crying out," Away with him!"