Parallel
Numbers 21:24
Jewish Publication Society 1917 · Berean Standard Bible
And Israel smote him with the edge of the sword, and possessed his land from the Arnon unto the Jabbok, even unto the children of Ammon; for the border of the children of Ammon was strong.
And Israel put him to the sword and took possession of his land, from the Arnon to the Jabbok—but only up to the border of the Ammonites, because it was fortified (note: Or because the territory was rugged; literally because it was strong).