Numbers 21:24
Israel defeated him with the edge of the sword, and took possession of his land from the Arnon to the Jabbok, as far as to the Ammonites; for the border of the Ammonites was strong — Israel's military victory is total; the defeated Amorites lose their entire territory. Israel takes possession from Arnon (southern border) to Jabbok (northern border), avoiding Ammonite territory (which appears to be defended and strong). This victory is Israel's first territorial conquest in Canaan proper.