Israel set liers-in-wait against Gibeah round about.
When the Benjamites, looking for an easy victory like that in the first two battles, thought that the Israelites were fleeing from them, they thoughtlessly pursued them, thus being drawn away from the very city they were trying to protect.  As soon as they were a sufficient distance from Gibeah, the liers-in-wait, ten thousand strong, attacked Gibeah and put the entire population to the sword, man, woman and child, as the children of Israel had destroyed Jericho.