What started the Israeli civil war against the tribe of Benjamin?

ANSWER

Some Benjamites raped and killed a Levites concubine

Judges 19 :

25 But the men would not listen to him. So the man took his concubine and sent her outside to them, and they raped her and abused her throughout the night, and at dawn they let her go. 26 At daybreak the woman went back to the house where her master was staying, fell down at the door and lay there until daylight.
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