In 1 Chronicles 20, the chapter begins by recounting a military campaign led by Joab, the commander of David's army, against the Ammonites. The Ammonites were a neighboring nation that had insulted and threatened Israel. Joab and his army besieged the Ammonite city of Rabbah, eventually capturing it and looting the city of its treasures. David took the crown from the Ammonite king's head, which was said to weigh a talent of gold, and placed it on his own head. The chapter then briefly mentions other battles against the Philistines, including a confrontation with a giant Philistine warrior named Lahmi, who was defeated by Elhanan, one of David's mighty men. Lastly, the chapter lists several significant achievements of David's military commanders.