Joshua 17:16

And the children of Joseph said, The hill, Mount Ephraim with its tributary ranges, is not enough for us; and all the Canaanites that dwell in the land of the valley have chariots of iron, built of wood, but covered with iron, and with heavy iron tires, both they who are of Beth-shean and her towns, and they who are of the Valley of Jezreel. Here the real reason for the request appears, namely, the unwillingness to undertake the conflict, although Jehovah had promised His assistance.