Some time later Israel's enemies from the East again crossed the Jordan and massed their forces in the Valley of Jezreel near Gideon's home (v. 33). They numbered 135,000, or 135 units, depending on the meaning of elephhere (8:10). "Thousand"seems preferable (cf. 7:12). This foray appears to have been the Midianites' annual invasion.
Gideon wished to reconfirm the Lord's promise to be with him and to lead him in victory against the enemy. Perhaps considerable time had elapsed between Gideon's call (vv. 11-32) and this new threat of attack.
The Spirit of the Lord came upon (lit. clothed) Gideon in a special way strengthening and defending him for his great task (v. 34; cf. Gen 28:20; Isa. 59:17). He then sent out a call for several of the other tribes to join him and his family to fight the Midianites (vv. 34-35).