So, "Judges" Chapter 20 - it's a real mess. Basically, all the tribes of Israel get together and decide to go to war against the Benjamites, because they had some dudes kidnap a couple of women. These women were from the town of Jabesh-gilead. So, the Benjamites don't show up to the fight, so the Israelites just kind of said "screw it" and went home. But then they decided to go back and fight them again and this time the Benjamites put up a fight, but the Israelites still won. So, in the end, the Israelites make the Benjamites take an oath that they won't give their daughters in marriage to anyone from any of the other tribes of Israel. And that's Chapter 20.