35 The LORD defeated Benjamin before Israel, and on that day the Israelites struck down 25,100 Benjamites, all armed with swords.

Read Judges 20:35 Using Other Translations

And the LORD smote Benjamin before Israel: and the children of Israel destroyed of the Benjamites that day twenty and five thousand and an hundred men: all these drew the sword.
And the LORD defeated Benjamin before Israel, and the people of Israel destroyed 25,100 men of Benjamin that day. All these were men who drew the sword.
So the LORD helped Israel defeat Benjamin, and that day the Israelites killed 25,100 of Benjamin’s warriors, all of whom were experienced swordsmen.