Then Jephthah gathered together all the men of Gilead, and fought with Ephraim; and the men of Gilead struck Ephraim, because they said, You are fugitives of Ephraim, you Gileadites, in the midst of Ephraim, [and] in the midst of Manasseh.
Unfortunately Jephthah treated his own brethren, the Ephraimites, as he had dealt with Israel’s enemy, the Ammonites. He unleashed his zeal and took vengeance far out of proportion to what might have been legitimate.