'Fortress' in the Bible

And different persons cried some different thing in the crowd. But he, not being able to know the certainty on account of the uproar, commanded him to be brought into the fortress.

But as he was about to be led into the fortress, Paul says to the chiliarch, Is it allowed me to say something to thee? And he said, Dost thou know Greek?

the chiliarch commanded him to be brought into the fortress, saying that he should be examined by scourging, that he might ascertain for what cause they cried thus against him.

And a great tumult having arisen, the chiliarch, fearing lest Paul should have been torn in pieces by them, commanded the troop to come down and take him by force from the midst of them, and to bring him into the fortress.

But Paul's sister's son, having heard of the lying in wait, came and entered into the fortress and reported it to Paul.

and on the morrow, having left the horsemen to go with him, returned to the fortress.