en_tn_condensed/isa/26/05.md

he will bring down those who live proudly

Yahweh humiliating those who are proud is spoken of as if proud people were up high and he would cause them to come down low. (See: rc://en/ta/man/jit/figs-metaphor)

the fortified city

This means fortified cities in general not a specific city. (See: rc://en/ta/man/jit/figs-genericnoun)

he will lay low ... he will level

Yahweh causing an army to destroy fortified cities is spoken of as if Yahweh would do it himself. (See: rc://en/ta/man/jit/figs-metonymy)