War between Sihon and Moses ensued, and ended in a brilliant victory for Israel. Sihon and his son, who equaled him in heroic strength, found their death in this fray. God had so brought it to pass that Israel had no need of laboriously waging war upon one city after another in Sihon's land, He had brought all the hosts of this Amorite king together into Heshbon. When this city therefore and the hosts within it were destroyed, all the rest of Sihon's land lay open before them.
Israel's victory was all the more marvelous, because Heshbon was an exceptionally well fortified city, so that, had gnats been its inhabitants, it could not have been captured by mortal means, much less so when manned by the hero Sihon and his heroic warriors. This victory was made possible only by the fact that God visited them with convulsions so terrible that they rolled up and writhed in pain, unable to stand in the battle lines, so that Israel could cut them down while they were half dead from convulsive pains.
God also drew masks over their faces, so that they could not see plainly, and taking one another for Israelites, slew their own people.