Jamieson, Fausset & Brown, on Judg 3:27

“And forthwith he sounded the trumpet in mount Ephraim: and the children of Israel went down with him, he himself going in the front.”

“he blew a trumpet in the mountain of Ephraim--summoned to arms the people of that mountainous region, which, adjoining the territory of Benjamin, had probably suffered most from the grievous oppression of the Moabites.”

Imported from an open dataset — not yet checked against the printed edition.