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And the men of Ephraim gathered themselves together and went northward, and said unto Jephthah: Wherefore wentest thou to fight with the children of Ammon, and didst not call us to go with thee? We will therefore burn thine house upon thee, with fire. And Jephthah said unto them: I and my people were at great strife with the children of Ammon. And the LORD delivered them into my hands. Wherefore then are ye come upon me to fight with me.
Sonia Ryang (2007) studied this question.