17Then the Ammonites were called to arms, and they encamped in Gilead. And the people of Israel came together, and they encamped at Mizpah.
This Mizpah was in the Transjordan. It was not the Mizpah on the border between Benjamin and Ephraim (as in Judges 20:1, Judges 20:3; Judges 21:1, Judges 21:5, Judges 21:8).
17 Then the Ammonites were called to arms, and they encamped in Gilead. And the people of Israel came together, and they encamped at Mizpah.