Albert Barnes Commentary Jeremiah 46:9

"Go up, ye horses; and rage, ye chariots; and let the mighty men go forth: Cush and Put, that handle the shield; and the Ludim, that handle and bend the bow." — Jeremiah 46:9 (ASV)

Rather, Go up, advance, ye horses; and drive furiously, ye chariots; and let the mighty men go forth. They march out of Egypt, arranged in three divisions: cavalry, chariots, and infantry, to begin the campaign. The armies of Egypt were composed chiefly of mercenaries. Cush (see the margin), the Black Nubians, and Phut, the Libyans of Mauritania, supplied the heavy-armed soldiers (Jeremiah 46:3); and Ludim, the Hamite Lydians of North Africa (see Genesis 10:13 note), a weaker race, served as light-armed troops.