Charles Ellicott Commentary Judges 20:46

"So that all who fell that day of Benjamin were twenty and five thousand men that drew the sword; all these [were] men of valor." — Judges 20:46 (ASV)

Twenty-five thousand men. —Eighteen thousand killed in battle, plus 5,000 on the paved roads (mesilloth), plus 2,000 near Rimmon, plus 600 survivors, makes 25,600. But as the Benjamites were 26,700 , either the total in Judges 20:15 is wrong, or we must make the much more natural supposition that 1,000 Benjamites, compared to 40,000 Israelites (which would only be 1 to 36), had fallen in the first two battles.