The military strategist is born not made.
For example:
Two youngsters, one the possessor of a permit, were fishing on a certain
estate when a gamekeeper suddenly darted from a thicket. The lad with
the permit uttered a cry of fright, dropped his rod, and ran off at top
speed. The gamekeeper was led a swift chase. Then, worn out, the boy
halted. The man seized him by the arm and said between pants: "Have you
a permit to fish on this estate?"
"Yes, to be sure," said the boy quietly.
"You have? Then show it to me."
The boy drew the permit from his pocket. The man examined it and frowned
in perplexity and anger.
"Why did you run when you had this permit?" he asked.
"To let the other boy get away," was the reply. "He didn't have any."