Deborah said to Barak, Up; for this is the day in which Yahweh has delivered Sisera into your hand; hasn't Yahweh gone out before you? So Barak went down from Mount Tabor, and ten thousand men after him.
Evidently God sent an unseasonable thunderstorm that mired Sisera’s chariots in the softened valley soil (cf. Judges 5:4-5; Judges 5:20-21). The main battle apparently took place near Taanach near the south central portion of the valley (Judges 5:19). The Israelites destroyed the whole Canaanite army that participated in this encounter (Judges 4:16).