The narrator gives only a summary of Jephthah’s itinerary. Jephthah left the Israelite military base at Mizpah of Gilead (Judges 10:17; Judges 11:32), travelled through Gilead into the territory of Manasseh, and then back home to Mizpah of Gilead. From Mizpah he went to where the Ammonites were camped.1
29 Then the Spirit of the LORD was upon Jephthah, and he passed through Gilead and Manasseh and passed on to Mizpah of Gilead, and from Mizpah of Gilead he passed on to the Ammonites.