I am not sure I would call him a "hero", but he was commander of the Union forces in the Civil War and became President of the United States.
US Grant.
he was in the army following his hero
he became president
Without a doubt - he was the hero of the war
William Henry Harrison
Charles de Gaulle
American General, and later President Zachary Taylor (1784-1850)
No, otherwise he would have never become a true hero.
Dwight D. Eisenhower
no
Andrew Jackson