New Revised Standard Version
David also struck down King Hadadezer of Zobah, toward Hamath, as he went to set up a monument at the river Euphrates.

Contemporary English Version
While King Hadadezer of Zobah was trying to gain control of the territory near the Euphrates River, David met him in battle at Hamath and defeated him.

New American Bible
David then defeated Hadadezer, king of Zobah, toward Hamath, who was on his way to set up his victory stele at the river Euphrates.

Douay-Rheims Bible
At that time David defeated also Adarezer king of Soba of the land of Hemath, when he went to extend his dominions as far as the river Euphrates.

At that time David defeated also Adarezer king of Soba of the land of Hemath, when he went to extend his dominions as far as the river Euphrates.

2 Samuel 8:3 David defeated also Adarezer the son of Rohob king of Soba, when he went to extend his dominion over the river Euphrates.

Hadadezer

1 Samuel 14:47 And Saul having his kingdom established over Israel, fought against all his enemies round about, against Moab, and against the children of Ammon, and Edom, and the kings of Soba, and the Philistines: and whithersoever he turned himself, he overcame.

2 Samuel 10:6 And the children of Ammon seeing that they had done an injury to David, sent and hired the Syrians of Rohob, and the Syrians of Soba, twenty thousand footmen, and of the king of Maacha a thousand men, and of Istob twelve thousand men.

Psalm 60:1 Unto the end, for them that shall be changed, for the inscription of a title, to David himself, for doctrine, [2] When he set fire to Mesopotamia of Syria and Sobal: and Joab returned and slew of Edom, in the vale of the saltpits, twelve thousand men. [3] O God, thou hast cast us off, and hast destroyed us; thou hast been angry, and hast had mercy on us.

by the river

Genesis 15:18 That day God made a covenant with Abram, saying: To thy seed will I give this land, from the river to Egypt even to the great river Euphrates.

Exodus 23:31 And I will set thy bounds from the Red Sea to the sea of the Palestines, and from the desert to the river: I will deliver the inhabitants of the land into your hands, and will drive them out from before you.