1 Chronicles 19:7-9

Young's Literal Translation

⁷ and they hire to them two and thirty thousand chariots, and the king of Maachah and his people, and they come in and encamp before Medeba, and the sons of Ammon have been gathered out of their cities, and come in to the battle.

⁸ And David heareth, and sendeth Joab, and all the host of the mighty men,

⁹ and the sons of Ammon come out and set battle in array at the opening of the city, and the kings who have come [are] by themselves in the field.