for every high tower, for every fortified wall,

You counted the houses in Jerusalem, ¹  and demolished houses so you could have material to reinforce the wall. ² 

Indeed, ¹  you have made the city ²  into a heap of rubble, the fortified town into a heap of ruins; the fortress of foreigners ³  is no longer a city, it will never be rebuilt.

For the fortified city ¹  is left alone; it is a deserted settlement and abandoned like the desert. Calves ²  graze there; they lie down there and eat its branches bare. ³ 

In the fourteenth year of King Hezekiah’s reign, ¹  King Sennacherib of Assyria marched up against all the fortified cities of Judah and captured them.

¹ Certainly you must have heard! ²  Long ago I worked it out, in ancient times I planned ³  it, and now I am bringing it to pass. The plan is this: Fortified cities will crash into heaps of ruins. ⁴