Numbers 21
23 Ref And Sihon would not suffer Israel to pass through his border: but Sihon gathered all his people together, and went out against Israel into the wilderness, and came to Jahaz; and he fought against Israel.
24 Ref 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.
25 Ref And Israel took all these cities: and Israel dwelt in all the cities of the Amorites, in Heshbon, and in all the towns thereof.