21 But the tribe of Benjamin, with their sharp-shooting lefties, killed 22,000 men.
Then the children of Israel cried all day before the Lord, and asked him,
Should we go to war against Benjamin?
And God said, "Yes, go fight against them."
24-25 So the Israelites fought the Benjaminites again the second day, and another 18,000 Israelites are killed.
26 Once again all of the Israelites sit and weep all day before God.
27 And they enquired of the Lord (because they had the ark of the covenant there in those days).
28 Phinehas, the grandson of Aaron, stood in front of the ark and said,
Should I fight against the children of Benjamin?
Go fight against them; tomorrow I will deliver them into your hand.
30 So the children of Israel fought against Benjamin.
35 And God smote the tribe of Benjamin, helping the Israelites kill 25,100 men.
37 Then Israelites killed everyone in the city of Gibeah with the edge of the sword.
47 But six hundred men survived from the tribe of Benjamin
48 The Israelites then killed all the men, animals, and everything they could find in every Benjamite city. Then they burned the cities to the ground.
A few more words about this episode
All of the Israelites assembled before the Lord in Mizpeh (20:1-2)
This was after each of the twelve tribes received a rotting piece of the Levite's concubine. See Judges 19, Episode 97
700 lefties (20:15)
The tribe of Benjamin seemed to favor left-handed people. Remember Ehud from Judges 3, Episode 85?
This is the same Phinehas (the grandson of Moses) who impaled the Israelite man and the Midianite woman back in Numbers 25:6-15 (Episode 66). So he would be about 450 years old - or the story is completely out of place chronologically and should have been one of the first chapters of Judges - not at the end of the book.