'Gates' in the Bible

The men of Israel and of Judah arose, and shouted, and pursued the Philistines, until you come to Gai, and to the gates of Ekron. The wounded of the Philistines fell down by the way to Shaaraim, even to Gath, and to Ekron.

It was told Saul that David had come to Keilah. Saul said, "God has delivered him into my hand; for he is shut in, by entering into a town that has gates and bars."