And Hadarezer sent, and brought out the Syrians that were beyond the river: and they came to Helam; and Shobach the captain of the host of Hadarezer went before them. The Syrians that were beyond the river - That is, the Euphrates.
Hadarezer - This is the same that was overthrown by David, 2 Samuel 8:3 and there called Hadadezer; which is the reading here of about thirty of Kennicott's and De Rossi's MSS. But the ר resh and ד daleth are easily interchanged.