They told Sisera that Barak the son of Abinoam was gone up to Mount Tabor.
When Sisera learned of the military muster of the Israelites at mount Tabor, he deployed his forces at the river Kishon, where he no doubt supposed that his force of nine hundred chariots of iron would be more than a match for Barak's troops.  However, there was a very heavy untimely rain that made a roaring river out of the Kishon and flooded the plains at the foot of mount Tabor  (Judges 4:5:4,19-21).  Simultaneously, Barak with his ten thousand men rushed down the steep slopes of Tabor and cut to pieces Sisera's entire force.  The chariots of iron were not merely useless, bogged down in the mud; but the charioteers, trapped in their mired vehicles, were an easy prey to Barak's men.  Sisera himself, seeing that the engagement was a total disaster, left his chariot and fled away on foot.  This astounding debacle that broke the back of Canaanite power could have been nothing other than a Divine intervention upon behalf of the Chosen People.  It was God who planned and precipitated the engagement, and it was God who sent the untimely rain.  It was God's foreknowledge of that rain and the very time when it would occur that lay behind this remarkable victory!