Charles F. Smith

Charles Ferguson Smith (April 24, 1807 – April 25, 1862) was a career United States Army officer who served in the Mexican–American War and as a Union General in the American Civil War.
As he rose slowly through the ranks of the peacetime army, he returned to West Point as an instructor and was appointed Commandant of Cadets as a first lieutenant, serving in that position from 1838 to 1843.
He then became a division commander in the Department of the Missouri under Brigadier General Ulysses S. Grant, who had been one of his pupils at West Point. This potentially awkward situation was eased by Smith's loyalty to his young chief. Smith's experience, dignity, and unselfish character made him Grant's mainstay in the early days of the war. Smith died of an infection following his foot injury and chronic dysentery at Savannah, Tennessee.
https://en.wikipedia.org/wiki/Charles_Ferguson_Smith