This emphasizes how weak and insignificant the invading army is before God. AT: "Yahweh will easily remove the horde of your invaders and the multitude of the ruthless ones"(See: [[rc://en/ta/man/translate/figs-simile]])
The translator can supply the verb "will become." AT: "the soldiers who show you no mercy will become as chaff" (See: [[rc://en/ta/man/translate/figs-ellipsis]])
The word "you" refers to the people of Jerusalem. Possible meanings are 1) "Yahweh of hosts will come to help you" or 2) "Yahweh of hosts will come to punish you." (See: [[rc://en/ta/man/translate/figs-you]])