1 Chronicles 20:1

And it came to pass that after the year was expired, at the season when warlike operations were usually resumed, at the time that kings go out to battle, Joab led forth the power of the army, the flower of his veteran troops, and wasted the country of the children of Ammon, thus chastising the Ammonites for their willful outrage on the Hebrew ambassadors, and came and besieged Rabbah, the most powerful fortress in the country. But David tarried at Jerusalem, coming over only after Joab had taken the lower town, and himself directing the storming of the citadel, 2 Samuel 12:26. And Joab smote Rabbah and destroyed it, David being present only in the last part of the campaign.