1 Chronicles 20:1-2

Revised Geneva Translation

20 And after the year had expired, in the time that kings go out to battle, Joab carried out the strength of the army and destroyed the country of the children of Ammon and came and besieged Rabbah (though David remained in Jerusalem). And Joab struck Rabbah and destroyed it.

² Then David took the crown of their king from off his head and found it to be the weight of a talent of gold, with precious stones in it. And it was set on David’s head. And he brought away a large amount of plunder from the city.