Judges 20:27

23 They went up and wept before the LORD until evening, inquiring of Him, “Should we again draw near for battle against our brothers the Benjamites?” And the LORD answered, “Go up against them.”

24 On the second day the Israelites advanced against the Benjamites.

25 That same day the Benjamites came out against them from Gibeah and cut down another 18,000 Israelites, all of them armed with swords.

26 Then the Israelites, all the people, went up to Bethel, where they sat weeping before the LORD. That day they fasted until evening and presented burnt offerings and peace offerings to the LORD.

27 And the Israelites inquired of the LORD. (In those days the ark of the covenant of God was there,

28 and Phinehas son of Eleazar, the son of Aaron, served before it.) The Israelites asked, “Should we again go out to battle against our brothers the Benjamites, or should we stop?” The LORD answered, “Fight, for tomorrow I will deliver them into your hand.”

29 So Israel set up an ambush around Gibeah.

30 On the third day the Israelites went up against the Benjamites and arrayed themselves against Gibeah as they had done before.

31 The Benjamites came out against them and were drawn away from the city. They began to attack the people as before, killing about thirty men of Israel in the fields and on the roads, one of which led up to Bethel and the other to Gibeah.

Read all of Judges 20