In the spring when kings march out [to war], Joab led the army and destroyed the Ammonites' land. He came to Rabbah and besieged it, but David remained in Jerusalem. Joab attacked Rabbah and demolished it.
References for 1 Chronicles 20:1
Then David took the crown from the head of their king, and it was [placed] on David's head. He discovered the crown weighed 75 pounds of gold, and there was a precious stone in it. In addition, David took away a large quantity of plunder from the city.
References for 1 Chronicles 20:2
He brought out the people who were in it and put them to work with saws, iron picks, and axes. David did the same to all the Ammonite cities. Then he and all his troops returned to Jerusalem.
References for 1 Chronicles 20:3
After this, a war broke out with the Philistines at Gezer. At that time Sibbecai the Hushathite killed Sippai, a descendant of the giants, and the Philistines were subdued.
References for 1 Chronicles 20:4
Once again there was a battle with the Philistines, and Elhanan son of Jair killed Lahmi the brother of Goliath the Gittite. The shaft of his spear was like a weaver's beam.
There was still another battle at Gath where there was a man of extraordinary stature with six fingers [on each hand] and six toes [on each foot]-24 in all. He, too, was descended from the giant.
References for 1 Chronicles 20:6
When he taunted Israel, Jonathan, son of David's brother Shimei, killed him.
These were the descendants of the giant in Gath killed by David and his soldiers.
References for 1 Chronicles 20:8