This cannot in any case be assumed earlier than the date of Tiglath Pilesar I., who did at least cross the euphrates and enter Northern Syria.
"The History of Antiquity, Vol. II (of VI)"
Max Duncker
Hence, even after the loss of Damascus, he had command of one of the roads to the euphrates.
"The History of Antiquity, Vol. II (of VI)"
Max Duncker
He gained the land of the Chaboras, and fixed himself firmly on the euphrates above the mouth of that river.
"The History of Antiquity, Vol. II (of VI)"
Max Duncker