Charles Ellicott Commentary Deuteronomy 13:15

"thou shalt surely smite the inhabitants of that city with the edge of the sword, destroying it utterly, and all that is therein and the cattle thereof, with the edge of the sword." — Deuteronomy 13:15 (ASV)

And their cattle. —So in Judges 20:48: the men of every city, the beast, and all that were found.