C. F. Keil and Franz Delitzsch on 1 Kings 20:1

1Ki 20:1

The First Victory. - 1Ki 20:1. Benhadad, the son of that Benhadad who had conquered several cities of Galilee in the reign of Baasha (1Ki 15:20), came up with a great army - there were thirty-two kings with him, with horses and chariots - and besieged Samaria. The thirty-two kings with him (אתּו) were vassals of Benhadad, rulers of different cities and the territory belonging to them, just as in Joshua’s time almost every city of Canaan had its king; they were therefore bound to follow the army of Benhadad with their troops.