Fort: Field Fortifications
Source: Nav
Deuteronomy 20:19, 20
When you lay siege to a city for an extended time while fighting against it to capture it, you must not destroy its trees by putting an axe to them, because you can eat their fruit. You must not cut them down. Are the trees of the field human, that you should besiege them? / But you may destroy the trees that you know do not produce fruit. Use them to build siege works against the city that is waging war against you, until it falls.
2 Kings 25:1
So in the ninth year of Zedekiah’s reign, on the tenth day of the tenth month, Nebuchadnezzar king of Babylon marched against Jerusalem with his entire army. They encamped outside the city and built a siege wall all around it.
Ezekiel 4:2
Then lay siege against it: Construct a siege wall, build a ramp to it, set up camps against it, and place battering rams around it on all sides.
Ezekiel 17:17
Pharaoh with his mighty army and vast horde will not help him in battle, when ramps are built and siege walls constructed to destroy many lives.
Ezekiel 26:8
He will slaughter the villages of your mainland with the sword; he will set up siege works against you, build a ramp to your walls, and raise his shields against you.