“The men of Israel were called out from Naphtali, Asher, and all Manasseh. They pursued after the Midianites. Then Gideon sent messengers throughout all the hill country of Ephraim. ‘Come down against the Midianites. Seize the waters against them, as far as Beth-barah, and also the Jordan.’ All the men of Ephraim were called out. They seized the waters as far as Beth-barah, and also the Jordan. They captured the two captains of Midian, Oreb and Zeeb. They killed Oreb at the rock of Oreb. They killed Zeeb at the wine press of Zeeb, as they pursued the Midianites. They brought the heads of Oreb and Zeeb to Gideon beyond the Jordan.”
Now that the Midianites were fleeing, more troops were needed. The men of Ephraim were called to protect the ‘waters.’ I assume that means the various wells or the streams or springs where people could get water. Beth-barah is only mentioned here and nowhere else. Oreb and Zeeb get special mention as places that got named after them. Their heads were given to Gideon.