Charles Ellicott Commentary Jeremiah 50:37

"A sword is upon their horses, and upon their chariots, and upon all the mingled people that are in the midst of her; and they shall become as women: a sword is upon her treasures, and they shall be robbed." — Jeremiah 50:37 (ASV)

And upon all the mingled people ... —The phrase is the same as in Jeremiah 25:20. Here it is used of the auxiliaries of Babylon, which were probably as numerous, and to a large extent the same, as those of Persia. (See Note on Jeremiah 50:9.) The treasures point to the wealth in which Babylon exulted, and which gave to her the epithet of the Golden City (Isaiah 14:4). Even under the Persian monarchy Æschylus uses “gold-abounding” as a normal epithet for it. (Persœ, 53.)