2 Samuel 10:15 (KJV)

And Joab drew nigh, and the people that were with him, unto the battle against the Syrians: and they fled before him.

And when the children of Ammon saw that the Syrians were fled, then fled they also before Abishai, and entered into the city. So Joab returned from the children of Ammon, and came to Jerusalem.

And when the Syrians saw that they were smitten before Israel, they gathered themselves together.

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.

And when it was told David, he gathered all Israel together, and passed over Jordan, and came to Helam. And the Syrians set themselves in array against David, and fought with him.