Charles Ellicott Commentary Judges 4:13

"And Sisera gathered together all his chariots, even nine hundred chariots of iron, and all the people that were with him, from Harosheth of the Gentiles, unto the river Kishon." — Judges 4:13 (ASV)

All his chariots. —He saw at once that this very sudden revolt had assumed formidable proportions, and he would need all his forces to dislodge Barak from his strongly entrenched position on Tabor.

Harosheth of the Gentiles. —This is simply the name of the town Harosheth-haggoîm. (See Judges 4:2.)