Albert Barnes Commentary 2 Samuel 10:16

"And Hadarezer sent, and brought out the Syrians that were beyond the River: and they came to Helam, with Shobach the captain of the host of Hadarezer at their head." — 2 Samuel 10:16 (ASV)

Helam - The location of this place is unknown. Some prefer the translation from the Latin Vulgate: “their army came.”