Albert Barnes Commentary Jeremiah 4:29

"Every city fleeth for the noise of the horsemen and bowmen; they go into the thickets, and climb up upon the rocks: every city is forsaken, and not a man dwelleth therein." — Jeremiah 4:29 (ASV)

The whole city ... - Rather, every city is fleeing. All the inhabitants of the settlements flee to Jerusalem for protection, or seek refuge in the woods and rocks.

The horsemen and bowmen - The cavalry (Jeremiah 4:13) and bowmen formed the chief strength of the Assyrian armies.

They shall go - They have gone.