Though the Lord's army were, by the express orders of Deborah, to be gathered from those two tribes, yet from some expressions we meet with after in Deborah's song, it should seem t hat there were others, who were, perhaps, volunteers in this sacred service. See Judges 5:15.
Related Commentaries of Judges 4:10
Judges 4:10
10 And Barak called Zebulun and Naphtali to Kedesh; and he went up with ten thousand men at his feet: and Deborah went up with him.