War with the Ammonites

When the Ammonites realized
that they had become a stench in David's nostrils,
they hired twenty thousand Aramean foot soldiers
from Beth Rehob and Zobah,
as well as the king of Maacah with a thousand men,
and also twelve thousand men from Tob.

On hearing this,
David sent Joab out with the entire army of fighting men.
The Ammonites came out
and drew up in battle formation
at the entrance to their city gate,
while the Arameans of Zobah and Rehob
and the men of Tob and Maacah
were by themselves in the open country.

Joab saw that there 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 of 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."

Then Joab and the troops with him
advanced to fight the Arameans,
and they fled before him.
When the Ammonites saw
that the Arameans were fleeing,
they fled before Abishai
and went inside the city.
So Joab returned from fighting the Ammonites
and came to Jerusalem.
(II Samuel 10:6-14)