The Red Badge of Courage.

Henry Fleming is a young Union soldier in the American Civil War. During his unit's first engagement, Henry flees the battlefield in fear. When he learns that the Union actually won the battle, shame over his cowardice leads him to lie to his friend Tom and the other soldiers, saying that he had been injured in battle. However, when he learns that his unit will be leading a charge against the enemy, Henry takes the opportunity to face his fears and redeem himself.