Rabbah

Rabbah - (Rab'bath, great.) 
(1.) "Rabbath of the children of Ammon," the
chief city of the Ammonites, among the eastern hills, some 20
miles east of the Jordan, on the southern of the two streams
which united with the Jabbok. Here the bedstead of Og was
preserved (Deut. 3:11), perhaps as a trophy of some victory
gained by the Ammonites over the king of Bashan. After David had
subdued all their allies in a great war, he sent Joab with a
strong force to take their city. For two years it held out
against its assailants. It was while his army was engaged in
this protracted siege that David was guilty of that deed of
shame which left a blot on his character and cast a gloom over
the rest of his life. At length, having taken the "royal city"
(or the "city of waters," 2 Sam. 12:27, i.e., the lower city on
the river, as distinguished from the citadel), Joab sent for
David to direct the final assault (11:1; 12:26-31). The city was
given up to plunder, and the people were put to
death, and "thus did he with all the cities of the children of
Ammon." The destruction of Rabbath was the last of David's
conquests. The crown of the king of Rabbah became David's crown.
His kingdom now reached its farthest limits (2 Sam.
8:1-15; 1 Chr. 18:1-15). The capture of this city is referred to
in Amos (1:14), Jeremiah (49:2, 3), and Ezekiel (21:20; 25:5).
(2.) A city in the hill country of Judah (Josh. 15:60),
possibly the ruin Rubba, six miles north-east of Beit-Jibrin.
==See also==
*Rabba
Category:Ammon
Category:Hebrew Bible places
Clark's Commentary and newer translations show that the text should say "made them slaves" and not that David killed them all.
pt:Rabá