en_tn/2ki/03/19.md

fortified city

A fortified city is well protected from enemies by such things as high walls or a easily defensible location.

ruin every good piece of land with rocks

This means to put rocks on the fertile land so that it is difficult to use. The meaning of this statement can be made clear. Alternate translation: "ruin every good piece of land by covering them with rocks" (See: rc://en/ta/man/translate/figs-explicit)