'Forts' in the Bible

And it came to pass in the ninth year of his reign, in the tenth month, in the tenth day of the month, that Nebuchadnezzar king of Babylon came, he, and all his host, against Jerusalem, and pitched against it; and they built forts against it round about.

And I will camp against thee round about, and will lay siege against thee with a mount, and I will raise forts against thee.

Because the palaces shall be forsaken; the multitude of the city shall be left; the forts and towers shall be for dens for ever, a joy of wild asses, a pasture of flocks;

And it came to pass in the ninth year of his reign, in the tenth month, in the tenth day of the month, that Nebuchadrezzar king of Babylon came, he and all his army, against Jerusalem, and pitched against it, and built forts against it round about.

Neither shall Pharaoh with his mighty army and great company make for him in the war, by casting up mounts, and building forts, to cut off many persons:

Say thou thus unto them, Thus saith the Lord GOD; As I live, surely they that are in the wastes shall fall by the sword, and him that is in the open field will I give to the beasts to be devoured, and they that be in the forts and in the caves shall die of the pestilence.