1 Chronicles 19:7-9

7They also hired 32,000 chariots and secured the support of the king of Maacah and his army. These forces camped at Medeba, where they were joined by the Ammonite troops that Hanun had recruited from his own towns.

8When David heard about this, he sent Joab and all his warriors to fight them.

9The Ammonite troops came out and drew up their battle lines at the entrance of the city, while the other kings positioned themselves to fight in the open fields.