David tortures the children of Ammon
1 And it came to pass, that after the year was expired, at the time that kings go out to battle, Joab led forth the power of the army, and wasted the country of the children of Ammon, and came and besieged Rabbah. But David tarried at Jerusalem. And Joab smote Rabbah, and destroyed it.
It was the time of the year when kings go to battle, so David sent Joab to destroy the Ammonites and besiege Rabbath. [1
2 And David took the crown of their king from off his head, and found it to weigh a talent of gold, and there were precious stones in it; and it was set upon David's head: and he brought also exceeding much spoil out of the city.
David put the king's gold crown on his head, which weighed about 30 kilograms [2
3And he brought out the people that were in it, and cut them with saws, and with harrows of iron, and with axes. Even so dealt David with all the cities of the children of Ammon. And David and all the people returned to Jerusalem.
David tortured the inhabitants of all the cities of Ammon, putting them under saws and axes. 
More wars and giant killing
4 And it came to pass after this, that there arose war at Gezer with the Philistines; at which time Sibbechai the Hushathite slew Sippai, that was of the children of the giant: and they were subdued.
There was a war with the Philistines at Gezer, where Sibbechai killed Sippai, who was the child of a giant
5 And there was war again with the Philistines; and Elhanan the son of Jair slew Lahmi the brother of Goliath the Gittite, whose spear staff was like a weaver's beam.
In another war with the Philistines, Elhanan killed Lahmi the brother of Goliath [4
6 And yet again there was war at Gath, where was a man of great stature, whose fingers and toes were four and twenty, six on each hand, and six on each foot and he also was the son of the giant.
7 But when he defied Israel, Jonathan the son of Shimea David's brother slew him.
And there was another battle in Gath, where a man of great stature was killed.
He had six fingers on each hand and six toes on each foot, and was also a son of a giant.
8These were born unto the giant in Gath; and they fell by the hand of David, and by the hand of his servants.
All of these sons of the giant
were killed by David and/or his men.