The lawlessness of the times was evident in the vile behavior of the men of Gibeah, a town of the tribe of Benjamin. A concubine was brutally raped and subsequently died. Her husband, a Levite, divided her corpse and sent pieces to each of the twelve tribes of Israel. The Israelites united against the offending tribe of Benjamites, who gathered together to defend their own.
The details of the battle can be read here.