Joab and Abishai Divide and Conquer

Joab saw that there were battle lines
in front of him and behind him;
so he selected some of the best troops in Israel
and deployed them against the Arameans.
He put the rest of the men
under the command of Abishai his brother
and deployed them against the Ammonites.
Joab said, "If the Arameans are too strong for me,
then you are to come to my rescue;
but if the Ammonites are too strong for you,
then I will come to rescue you.
Be strong and let us fight bravely for our people
and the cities of our God.
The Lord will do what is good in His sight."

(II Samuel 10:9-11)