The Ammonites: Chief Cities of Rabbah

Meanwhile, Joab fought against Rabbah of the Ammonites and captured the royal fortress.

Then Joab sent messengers to David to say, “I have fought against Rabbah and have captured the water supply of the city.

Wail, O Heshbon, for Ai has been destroyed; cry out, O daughters of Rabbah! Put on sackcloth and mourn; run back and forth within your walls, for Milcom will go into exile together with his priests and officials.