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. (Deuteronomy 20:20)
Literally, “siege-works” (RSV). The reference is to various of ramparts, trenches, etc., built to aid in the subjugation of a city. The same word is translated “fenced” (2 Chron. 8:5); “for defence” (2 Chron. 11:5); “fortress” (Jer. 10:17); “fortified” (Micah 7:12); “the tower” (Hab. 2:1; cf. 2 Chron. 26:15; 2 Sam. 20:15).