Gileadites and Ephraimites At War
The Gileadites were a clan within Manasseh, dwelling east of the Jordan and north of the Dead Sea. They appear to have been very independent of their tribe, and this independence irked the men of Ephraim, who generally headed the House of Joseph. Hence their accusation that the Gileadites were fugitives among Ephraim and Manasseh (verse 4).
Now that the war with Ammon was over, the men of Ephraim suddenly showed courage. They accused Jephthah of deliberately failing to summon them to the battle as a means of humiliating the leading tribe in Joseph, and they intended to wage war against him. Led by Jephthah, the Gileadites steadfastly held their ground, taking the strategic byways and heights. They recognized Ephraimite infiltrators by their distinctive accent (showing that even in a small geographical region like Israel there were sharp delineations between—and sometimes bitter divisions among—the Israelite tribes and clans). However, the battle went entirely in favor of Jephthah and the Gileadites, and Gilead remained independent of their larger tribal units.
Jephthah judged only six years. After him a long series of judges followed: Ibzan of Bethlehem, seven years; Elon the Zebulonite, ten years; Abdon the Pirathonite (Ephraimite), eight years. Thus Israel enjoyed a total of 31 years of peace.