The first and the second ward; guard or sentinels. The iron gate that leadeth unto the city; the outermost gate that led out of the prison into the city, not that the prison itself was out of the city. Which opened to them of his own accord: God worketh a series of miracles in their fit place and time; he could have done them all together, and have opened his iron gate beforehand, when he conducted Peter through the first, then through the second watch; but it is good for Peter, and us, to be convinced that we stand every moment in need of God's conduct and deliverance.
Related Commentaries of Acts 12:10
Acts 12:10
10 When they were past the first and the second ward, they came unto the iron gate that leadeth unto the city; which opened to them of his own accord: and they went out, and passed on through one street; and forthwith the angel departed from him.