ORIGINAL: Leibst
I've been thinking even going further, not in an Ageod game, but in a future engine, regarding having even less information and not as we have here an online information of what is happening to us the player, the commander of all the armies.
A game simulating you are in a city, where you have the Heaquarter of your whole Army, and from there send orders that really have to be sent and arrive to the destiny, receive reports and that in the UI map you see what your reports say and in fact dont has to be the real situation until you receive an update. For example you are Gen Washington and you are in New York, some weeks ago you sent Greene with 4k men to advance to Saratoga and take it. You can see where was Greene the day your last update says, but you really dont know if Sarataga has fallen or even Greene has been defeated.
In such a game you have no control over the combat unless you are in command of the army in the battle phisically, but you are the whole commander of all the troops, leaders, resources,....
Interesting Matrix "Campaigns on the Danube" By Frank Hunter has something like that 'Full FOW'; it's an older game but might be worth taking a look at it. I've never had the nerve to try that level... here's an quote from the manual.
3.2.3 Full
Campaigns on the Danube – User manual
With Full Fog on the player cannot see the enemy units
but also cannot see his own units! When units are visible
on the map the player has to remember that that is only
the last reported position of the unit, whether it be friendly
or enemy. The reported positions may be several hours
old, or even longer. With this setting even combat results
and the capture of towns exist only in reports that have to
travel back to the player in order to be read.
This setting provides the most realistic battlefield
conditions. It is recommended that players do not start
with this setting when first being introduced to the system.
In a game between two experienced players, however, it
presents a very interesting option.
http://www.matrixgames.com/products/product.asp?gid=282