For Heshbon was the city of Sihon king of the Amorites, who had fought against the former king of Moab and taken all his land out of his hand, as far as the Arnon.
In context
24Israel struck him with the edge of the sword and took possession of his land from the Arnon to the Jabbok, as far as the Ammonites — for the border of the Ammonites was fortified. 25Israel took all these cities and settled in all the cities of the Amorites, in Heshbon and all its villages. 26For Heshbon was the city of Sihon king of the Amorites, who had fought against the former king of Moab and taken all his land out of his hand, as far as the Arnon. 27That is why the poets say: “Come to Heshbon — let it be built, let the city of Sihon be established. 28For fire went out from Heshbon, a flame from the city of Sihon; it consumed Ar of Moab, the lords of the heights of the Arnon.