2 Samuel 10:8-9

8The Ammonite troops came out and drew up their battle lines at the entrance of the city gate, while the Arameans from Zobah and Rehob and the men from Tob and Maacah positioned themselves to fight in the open fields.

9When Joab saw that he would have to fight on both the front and the rear, he chose some of Israel’s elite troops and placed them under his personal command to fight the Arameans in the fields.