2 Samuel 2:30-31

Nineteen men … three hundred and three score men. Though David's "mighties," as they were called, excelled in the use of arms, yet the disparity of numbers is remarkable; for the Benjamites were also famous warriors. We can only account for it by the superiority of the tactics of Joab, who was a man of consummate military skill, and who knew both how to gain a victory and how to use the advantage which the pursuers have over the pursued to the full. If we sometimes wonder that David endured Joab so long, we ought to remember how much he owed to his nephew's genius, and that Joab was always faithful to himself.