In the fourth story of the series, we see, from the vantage point of Dick Mason, a Union officer, the events surrounding the battle of Antietam.
Chapter 1: Cedar Mountain
Chapter 2: At The Capital
Chapter 3: Beside the River
Chapter 4: Springing the Trap
Chapter 5: The Second Manassas
Chapter 6: The Mournful Forest
Chapter 7: Orders No. 191