The three mighty men of David: Why some soldiers become great?

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Introduction
Why do some soldiers become great?
The exceptional military achievements of David's army were par excellence. Out of these, the three mighty men of David were the most outstanding. (2 Samuel 23:8-17)
#1: Triumph Over Limitations
Josheb-Basshebeth: He raised his spear against eight hundred men, whom he killed in one encounter.
#2: Triumph Over Impossibilities
Eleazar: He stood his ground and struck down the Philistines till his hand grew tired and froze to the sword.
#3: Triumph Over Larceny
Shammah: He took his stand in the middle of the field. He defended it and struck the Philistines down.