Nahum often wrote prophecy in the form of poetry. Hebrew poetry uses different kinds of parallelism. Here he begins to describe the destruction of Nineveh. (See: [[rc://en/ta/man/translate/writing-poetry]] and [[rc://en/ta/man/translate/figs-parallelism]])
The word "you" refers to Nineveh. Nahum speaks of an army or military leader destroying Nineveh as if he were to shatter Nineveh like one would shatter a clay pot. Alternate translation: "The one who will destroy you" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Nahum speaks to the people of Nineveh. He tells them to prepare for battle, although he knows that the enemy will destroy the city. (See: [[rc://en/ta/man/translate/figs-irony]])
Nineveh had a large, thick wall surrounding it. This refers to placing soldiers on the top of the wall in order to fight off attackers. This can be translated with a more general phrase if necessary. Alternate translation: "Man the fortifications" or "Prepare the defenses" (See: [[rc://en/ta/man/translate/figs-explicit]])
This is an idiom that means to prepare oneself for action. Here it applies to military action. Alternate translation: "prepare yourselves for battle" (See: [[rc://en/ta/man/translate/figs-idiom]])