John Gill Commentary Judges 20:35

"And Jehovah smote Benjamin before Israel; and the children of Israel destroyed of Benjamin that day twenty and five thousand and a hundred men: all these drew the sword." — Judges 20:35 (ASV)

And the Lord smote Benjamin before Israel
Gave Israel the victory over them at Baaltamar; for notwithstanding all the art and stratagem they used, their numbers and their valour, victory was of the Lord, and to him it is ascribed; for until now Benjamin, though fewer in number, had been always victorious; and the children of Israel destroyed of the Benjaminites that day 25,100; which is the total sum of all that were slain of them that day, the particulars of which are afterwards given:

all these drew the sword ;
were armed men.