Judges 20:34-38

When ten thousand choice men from all Israel came against Gibeah, the battle became fierce; but Benjamin did not know that disaster was close to them.

And the Lord struck Benjamin before Israel, so that the sons of Israel destroyed 25,100 men of Benjamin that day, all who drew the sword.

So the sons of Benjamin saw that they were defeated. When the men of Israel gave ground to Benjamin because they relied on the men in ambush whom they had set against Gibeah,

the men in ambush hurried and rushed against Gibeah; the men in ambush also deployed and struck all the city with the edge of the sword.

Now the agreed sign between the men of Israel and the men in ambush was that they would make a great cloud of smoke rise from the city.