Charles Ellicott Commentary Judges 11:20

"But Sihon trusted not Israel to pass through his border; but Sihon gathered all his people together, and encamped in Jahaz, and fought against Israel." — Judges 11:20 (ASV)

Trusted not Israel. —Sihon did not believe their promise to pass peacefully through his land.

Pitched in Jahaz. —Numbers 21:33; Isaiah 15:4; Jeremiah 48:3. The site of the battle has not been ascertained.