1 Chronicles 19:6-7

6When the sons of Ammon saw that they had made themselves repulsive to David, Hanun and the sons of Ammon sent 1a thousand talents of silver to hire for themselves chariots and horsemen from Mesopotamia, Aram-maacah, and 2Zobah.

7So they hired for themselves thirty-two thousand chariots, and the king of Maacah and his people, who came and camped opposite 3Medeba. And the sons of Ammon gathered together from their cities and came to the battle.