From Electronic Arts:
Sid Meier's Gettysburg is a real-time game simulating one of the most dramatic battles in the American Civil War, and possibly one of the most studied battles in wartime history. Its features include 3D-animated soldiers, cannons, cavalries, and generals that move, change formation, fire, retreat, and attack in real time on the accurate, scalable, and rotating 3D view of the Gettysburg battlefield. Other features include an icon-driven command system, four difficulty levels, and the ability to customize the enemy/computer AI. This demo version of the game lets you play three scenarios from the Yankee point of view and includes the full set of tutorials and one full week of multiplayer matches.