Damascus, Zobah and Hamath
In the north David conquered Zobah and their mighty army which possessed 1000 chariots, 700 horsemen, and 20,000 foot soldiers.
2 Sam 8:3-4
David also defeated Hadadezer the son of Rehob, king of Zobah, as he went to recover his territory at the River Euphrates. David took from him one thousand chariots, seven hundred horsemen, and twenty thousand foot soldiers.
It is interesting that David's army did not depend on chariots as the king of Zobah, as well as the Philistines and the Canaanites.
When the men of Aram Damascus (see map) heard of the battle they came to assist Zobah and were too late. David utterly defeated them as well and they paid tribute to Israel. At this same time the king of Hamath sent his son to pay tribute to David and this secured the northern region. David placed garrisons in Damascus as he had done in Edom.