The Red Badge of Courage & Other Tales from the Civil War

"The Red Badge of Courage" – Taking place during the American Civil War, the story is about a young private of the Union Army, Henry Fleming, who flees from the field of battle. Overcome with shame, he longs for a wound, a "red badge of courage," to counteract his cowardice.
"The Little Regiment and Other Episodes from the American Civil War" is a collection of short stories with the Civil War as the main theme:
The Little Regiment
Three Miraculous Soldiers
A Mystery of Heroism
An Indiana Campaign
A Grey Sleeve
The Veteran