Walls of Cities were Battered by Besieging Armies
Source: TTT
2 Samuel 20:15
And Joab’s troops came and besieged Sheba in Abel-beth-maacah and built a siege ramp against the outer rampart of the city. As all the troops with Joab were battering the wall to topple it,
Ezekiel 4:2, 3
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. / Then take an iron plate and set it up as an iron wall between yourself and the city. Turn your face toward it so that it is under siege, and besiege it. This will be a sign to the house of Israel.