Charles Ellicott Commentary Jeremiah 33:5

"while [men] come to fight with the Chaldeans, and to fill them with the dead bodies of men, whom I have slain in mine anger and in my wrath, and for all whose wickedness I have hid my face from this city:" — Jeremiah 33:5 (ASV)

They come to fight with the Chaldeans ... —The Hebrew construction is participial, and has the force expressed in English by “they” used indefinitely. The prophet sees, as it were, a sortie of the besieged, but it is doomed to failure, and the houses of the city are filled with those who were slain by the sword, as well as by famine and pestilence (Jeremiah 32:24).