Deuteronomy 20:20 Only the trees which thou knowest that they [be] not trees for meat, thou shalt destroy and cut them down; and thou shalt build bulwarks against the city that maketh war with thee, until it be subdued.
Ecclesiastes 9:14 [There was] a little city, and few men within it; and there came a great king against it, and besieged it, and built great bulwarks against it:
2 Chronicles 26:15 And he made in Jerusalem engines, invented by cunning men, to be on the towers and upon the bulwarks, to shoot arrows and great stones withal. And his name spread far abroad; for he was marvellously helped, till he was strong.