Who Did the Drawing on the Cover of “Nothing Less than Victory”?

Where did the cover of “Nothing Less than Victory” come from? Who did this wonderful drawing?

The answer is: William Tecumseh Sherman, When he was an 18 year-old cadet at West Point Military Academy.
“Theseus Killing the Centaur” is preserved in the West Point Military Museum, West Point, New York.
I appreciate their assistance! Here is the drawing, as found in the museum: