In the spring of the year, when kings normally go out to war, David sent Joab and the Israelite army to fight the Ammonites. They destroyed the Ammonite army and laid siege to the city of Rabbah. However, David stayed behind in Jerusalem.
(King Og of Bashan was the last survivor of the giant Rephaites. His bed was made of iron and was more than thirteen feet long and six feet wide. It can still be seen in the Ammonite city of Rabbah.)