Thematic Bible: Victories of joab over

When David heard, he sent Joab and all the army of mighty warriors. The {Ammonites} came out and {drew up a battle formation} at the entrance of the gate, but Aram-Zobah and Rehob and the men of Tob and Maacah [were] alone in the open field. When Joab saw that {the battle was to be fought on two fronts}, he chose from all [the] members of the elite troops of Israel and {lined them up for battle} to meet Aram. read more.
The rest of the army he placed into the hand of his brother Abishai, who {arranged them in battle lines} to meet the {Ammonites}. Then he said, "If Aram [is] stronger than I [am], you must become my deliverer; but if the {Ammonites} [are] too strong for you, then I will come to rescue you. Be strong, and let us strengthen ourselves for the sake of the people and for the sake of the cities of our God. May Yahweh do [what is] good in his eyes. Joab and all the people who [were] with him moved forward into the battle against Aram, and they fled from before him. When the {Ammonites} saw that Aram had fled, they fled from before Abishai and entered the city. Then Joab returned from [fighting] against the {Ammonites} and came to Jerusalem.

And Joab fought against Rabbah of the {Ammonites}, and he captured {the royal city}. Then Joab sent messengers to David and said, "We have fought against Rabbah, and we captured the city of the waters. So then, gather the remainder of the army and encamp against the city and capture it, lest I capture the city and my name be proclaimed over it." read more.
So David gathered all of the army, and he went to Rabbah and fought against it and captured it.