David, gathered all the people together; either because Joab needed more help for the storming of the city; or, at least, for the prosecution of the victory, and execution of justice upon the whole land; or because he would have them all to partake of the spoil of the city, which was there in great abundances, 2 Samuel 12:30; the rather because they were all exposed to the hazard of utter ruin, in case the Ammonites had prevailed against them.
Related Commentaries of 2 Samuel 12:29
2 Samuel 12:29
29 And David gathered all the people together, and went to Rabbah, and fought against it, and took it.