Sihon would not allow 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.
TSK
TSK · Joshua 12:2
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"Rise up, take your journey, and pass over the valley of the Arnon: behold, I have given into your hand Sihon the Amorite, king of Heshbon, and his land; begin to possess it, and contend with him in battle.
The king of the children of Ammon answered to the messengers of Jephthah, "Because Israel took away my land, when he came up out of Egypt, from the Arnon even to the Jabbok, and to the Jordan: now therefore restore those [lands] again peaceably."
Moreover you gave them kingdoms and peoples, which you allotted according to their portions. So they possessed the land of Sihon, even the land of the king of Heshbon, and the land of Og king of Bashan.
Sihon king of the Amorites; for his loving kindness endures forever;