The elders of Gilead said to Jephthah, Therefore are we turned again to you now, that you may go with us, and fight with the children of Ammon; and you shall be our head over all the inhabitants of Gilead.
Notice how the writer of Judges constructed these first 11 verses parallel to Judges 10:6-16. The elders of Gilead had treated Jephthah exactly as Israel had treated Yahweh.