Judges 20:29-33

So the Israelites set an ambush all around Gibeah. They went out on the third day and took their positions at the same place as before. When the men of Benjamin came out to attack, they were drawn away from the town. And as they had done before, they began to kill the Israelites. About thirty Israelites died in the open fields and along the roads, one leading to Bethel and the other leading back to Gibeah. Then the warriors of Benjamin shouted, “We’re defeating them as we did before!” But the Israelites had planned in advance to run away so that the men of Benjamin would chase them along the roads and be drawn away from the town. When the main group of Israelite warriors reached Baal-tamar, they turned and took up their positions. Meanwhile, the Israelites hiding in ambush to the west of Gibeah jumped up to fight.