The game is basicly N:TW, battle mode only and with a lot more realism. Let's stick with the Napoleonic Period for now. You command a certain sized-command, such as a brigade, division, corps of maybe even an entire army, with every regiment being realistically shown in full size. Soldiers, officers, horses, everything. Infantry, cavalry, artillery. You can give commands to as small as a certain company moving somewhere, to an entire battalion, regiment, or brigade. People get shot, wounded, retreat, desert. They rest, they eat, they run out of supplies and have to be re-supplied. You take buildings, heights, construct fortifications, et cetera. Bit like a cross-over of N:TW and Scourge of War.
(Such a game can probably not even be made with current technological standards that we have - But I have hope.)