Matthew Poole and continuators on Judges 5:19

19 The kings came and fought: then fought the kings of Canaan in Taanach, by the waters of Megiddo , they took no gain of mony .

Either confederate with him, or subject to him: for it is known, that there were divers petty Kings in those parts; which also oft-times were subject to one greater and more potent king; and particularly, this Hazor, where this Iabin now Reigned, Iudg. 4. 2. was beforetime the head of divers petty Kingdoms, Ios. 11. 10.

Taanach and Megiddo were two eminent Cities belonging indeed to Manasseh, Iudg. 1. 27. but seated in the Tribe of Issachar, Ios. 17. 11. not far from Mount Tabor, Ios. 17. 10. Iudg. 1. 27. nor from the River Kishon.

Either, First, from Sisera, they fought without Pay, whether from meer hatred of the Israelites, and a desire to be revenged upon them: or from a full hope and confidence of Paying themselves abundantly out of Israels spoils. Or, Secondly, From the Israelites; so the sence is, They fell, lost all their hopes of Money, and rich Spoils and Booty, which they assured themselves of; instead of gaining a Prey, they lost Themselves.