1 Chronicles 19:7-9

7So they hired for themselves thirty-two thousand chariots, with the king of Maacah and his people, who came and encamped before Medeba. Also the people of Ammon gathered together from their cities, and came to battle.

8Now when David heard of it, he sent Joab and all the army of the mighty men.

9Then the people of Ammon came out and put themselves in battle array before the gate of the city, and the kings who had come were by themselves in the field.