Napoleonic would be good, agreed. But the mid-19th century has been almost untouched in computer war games. Franco Prussian, Austro Prussian, Franco Austrian wars are all great prospects to be developed. WWI IF it was early war period and not the trench "meat-grinder" time period. Later period would require a LOT of development of machine guns, long-range artillery, aircraft, tanks, etc. Much easier to do wars that are closely related to the Gettysburg era...