Deu 20:20 | JFB | STEP | 20. thou shalt build bulwarks against the city that maketh war with thee —It is evident that some sort of military engines were intended; and accordingly we know, that in Egypt, where the Israelites learned their military tactics, the method of conducting a siege was by throwing up banks, and making advances with movable towers, or with the testudo [WILKINSON ].

Deuteronomy 20:20

20. thou shalt build bulwarks against the city that maketh war with thee—It is evident that some sort of military engines were intended; and accordingly we know, that in Egypt, where the Israelites learned their military tactics, the method of conducting a siege was by throwing up banks, and making advances with movable towers, or with the testudo [WILKINSON].