In Deuteronomy 20:10-18, upon finding the Promised Land and discovering it already populated by people, the 12 Tribes of Israel are ordered by God to enslave or kill everyone.
After 40 years of wandering in the desert, the Israelites had become something of a zealous kill force, obliterating everything in their path at God's behest. If they disobey, God has horrors in store for them (Deuteronomy 28:15-68).
In Judges 19:11-30, while visiting Gibeah, an Israelite priest and his concubine are invited to stay the night in an old man's house. The men of Gibeah surround the house and demand to have sex with the priest. The old man of the house offers his virgin daughter to the men instead, but they don't want her. Then the priest throws his concubine out of the house and the men of Gibeah rape and abuse her all night, leaving her to die on the doorstep of the old man's house.
So what does the priest do? He hacks the body of his concubine in 12 pieces and sends one to each of the 12 Tribes of Israel, so they will get angry and attack Gibeah.
Seems a bit passive aggressive.
But it works and in Judges 20:1-46, the ensuing war kills over 65,000 people.
These were bloody times...