It’s historical fiction, but well grounded in actual events: The Killer Angels by Michael Shaara.
“The Killer Angels by Michael Shaara.”
Along with:
“Gods and Generals”, and “Last Full Measure”, by Jeff Shaara
“William Tecumseh Sherman: In the Service of My Country: A Life”, by James Lee McDonough
“Rebel Yell: The Violence, Passion and Redemption of Stonewall Jackson”, by S.C Gwynne