1 Chronicles 19:7-9

7So they hired for themselves thirty-two thousand chariots, as well as the king of Maacah with his troops, who came and camped near Medeba while the Ammonites were mustered from their cities and marched out for battle.

8On hearing this, David sent Joab and the entire army of mighty men. 9The Ammonites marched out and arrayed themselves for battle at the entrance to the city, while the kings who had come stayed by themselves in the open country.