The Campaigns of Robert E. Lee (1988)

From the box:
Strategic-operational simulation of warfare in the eastern theater. The game offers ten scenarios covering fighting between Union and Confederate forces in Virginia, Maryland, and Pennsylvania between 1861 and 1865. Each turn represents about five days of real time; each hex an area of roughly four miles across. Players are faced with the same problems of strategy and tactics their historical counterparts faced throughout the war.

Nominee for the 1988 Charles S. Roberts awards for Best Pre-World War II Boardgame (Charles S. Roberts Awards).

This game is followed by The Army of the Heartland which uses the same rules for simulating The Army of Tennessee's Campaigns of 1861-1863.