John Gill Commentary Nahum 3:5

"Behold, I am against thee, saith Jehovah of hosts, and I will uncover thy skirts upon thy face; and I will show the nations thy nakedness, and the kingdoms thy shame." — Nahum 3:5 (ASV)

Behold, I [am] against you, says the Lord of hosts
Because her doings were against him; (See Gill on Nahum 2:13): and I will discover your skirts upon your face ;

turn up the skirts of her garments over her head, and thereby discover what should be concealed, than which nothing is more disagreeable and abominable to modest persons; it is here threatened she should be used in character as a harlot, or as women oftentimes are by rude soldiers, when a city is taken by them.

and I will show the nations your nakedness, and the kingdoms your
shame ;
all her charms shall be taken away, and she become odious as a harlot to her former lovers; all her impostures, arts, and tricks, and shameful actions, will be discovered; and her aims and views at universal monarchy will be seen and her weakness to effect it made to appear; and, upon the whole, will become the object of the scorn and derision of kingdoms and nations.