Adam Clarke on Judges 20:35

Twenty and five thousand and a hundred - As the Benjamites consisted only of twenty-six thousand and seven hundred slingers; or, as the Vulgate, Septuagint, and others read, twenty-five thousand, which is most probably the true reading; then the whole of the Benjamites were cut to pieces, except six hundred men, who we are informed fled to the rock Rimmon, where they fortified themselves.