NET

39 the Israelites counterattacked. Benjamin had begun to strike down the Israelites; they struck down about thirty men. They said, “There’s no doubt about it! They are totally defeated as in the earlier battle.”

Darby

39 And when the men of Israel turned back in the battle, Benjamin began to smite, slaying of the men of Israel about thirty men; for they said, Surely they are quite routed before us as in the first battle.

KJV

39 And when the men of Israel retired in the battle, Benjamin began to smite [and] kill of the men of Israel about thirty persons: for they said, Surely they are smitten down before us, as [in] the first battle.