The kings came and fought; Then fought the kings of Canaan. In Taanach by the waters of Megiddo: They took no gain of money.
"The kings came and fought"  (Judges 5:19).  A number of very careless commentators write very freely about who "the king" of Canaan was.  Note the plural "kings" here.  We have no idea how many "kings" of Canaan there were, but the story of Adonibezek, as we noted earlier, mentions no less than "seventy kings" which he had conquered, and it is a fair guess that there were dozens of such petty "kings"' involved in this war with Israel. For purposes of defense, they had all joined forces under Jabin, and Jabin had named Sisera, in all probability another one of the petty "kings" of Canaan, as the commander-in-chief of the united armies.