Then the children of Ammon were gathered together, and encamped in Gilead. The children of Israel assembled themselves together, and encamped in Mizpah.
"The people of Gilead, the princes of Gilead"  (Judges 10:18).  These phrases are in apposition, and the meaning would be clearer if the passage were written, The people of Gilead, that is, the princes of Gilead.