2 Samuel 12:26

And Joab fought against Rabbah of the {Ammonites}, and he captured {the royal city}.

Deuteronomy 3:11

(For only Og, king of Bashan, was left from the remnant of the Rephaim. Indeed, his bedstead--it [was] a bedstead of iron. It is in Rabbah of the {Ammonites}. Nine cubits [is] its length, and four cubits [is] its width according to the cubit of a man.)

1 Chronicles 20:1-3

And it happened [that] {in the spring time of year}, the time [when] kings go out [to battle], Joab led the troops of the army and destroyed the land of the {Ammonites}. And he came and besieged Rabbah, but David remained in Jerusalem. And Joab struck Rabbah and destroyed it.

2 Samuel 11:25

Then David said to the messenger, "Thus you shall say to Joab, '{Do not feel badly about this matter}; {now one and then another} the sword will devour. Intensify your attack on the city and overthrow it.'" And he encouraged him.

Treasury of Scripture Knowledge

Summary

And Joab fought against Rabbah of the children of Ammon, and took the royal city.

Bible References

Joab

2 Samuel 11:25
Then David said to the messenger, "Thus you shall say to Joab, '{Do not feel badly about this matter}; {now one and then another} the sword will devour. Intensify your attack on the city and overthrow it.'" And he encouraged him.
1 Chronicles 20:1
And it happened [that] {in the spring time of year}, the time [when] kings go out [to battle], Joab led the troops of the army and destroyed the land of the {Ammonites}. And he came and besieged Rabbah, but David remained in Jerusalem. And Joab struck Rabbah and destroyed it.