Judges 20:29-31

Then Israel set an ambush around Gibeah. They went up against the Benjamites on the third day and took up positions against Gibeah as they had done before. The Benjamites came out to meet them and were drawn away from the city. They began to inflict casualties on the Israelites as before, so that about thirty men fell in the open field and on the roads—the one leading to Bethel and the other to Gibeah.