2 Samuel 10:6-8

6Now when the children of Ammon saw that they had become a stench to David, the children of Ammon sent and hired the Arameans of Beth-Rehob and the Arameans of Zobah, 20,000 foot soldiers, and the king of Maacah with 1,000 men, plus 12,000 men from Tob.

7When David heard about it, he sent Joab and the whole army—the mighty warriors.

8The children of Ammon came out and lined up in battle array at the entrance of the gate, while the Arameans of Zobah and Rehob and the men of Tob and Maacah were by themselves in the field.