Judges 12:2

And Jephthah, in an endeavor to make the situation clear to the arrogant meddlers, said unto them, I and my people were at great strife with the children of Ammon, literally, "A man of war was I, I and my people, and the children of Ammon [on the other side] very"; he and his fellow-citizens were engaged in a severe struggle with the invaders; and when I called you, this fact being omitted in chapter 11, because it had been unsuccessful, ye delivered me not out of their hands. The Ephraimites had probably refused to take part in the campaign because Jephthah had been chosen leader without their consent.