Sieges: Cities Invested by Repaired and Newly Fortified Beforehand
Source: TTT
2 Chronicles 32:5
Then Hezekiah worked resolutely to rebuild all the broken sections of the wall and to raise up towers on it. He also built an outer wall and reinforced the supporting terraces of the City of David, and he produced an abundance of weapons and shields.
Isaiah 22:9, 10
You saw that there were many breaches in the walls of the City of David. You collected water from the lower pool. / You counted the houses of Jerusalem and tore them down to strengthen the wall.
Nahum 3:14
Draw your water for the siege; strengthen your fortresses. Work the clay and tread the mortar; repair the brick kiln!