Rupert Clamp is running his game on the Jena campaign. It's a double blind campaign map game, a bit like a structured Kriegspiel but with his own system.
It also has a face to face battle system, that takes place during campaign time, so a legitimate strategy is to tie an opposing division or corps down on a battle map whilst your allies march to the sound of the guns.
In my view these are the best megagames. The more pure political megagames can go 'I do what I want because I say roleplaying'. By facing the players with the unknown of a hidden map and the harsh consequences of war people start to do something incredible, they think. You can pull of gambits that never work in open map games, and the chain of command and inter-team rivalry creates a whole lot of political fiasco on the side.
The game starts fairly early in the campaign (French still at Wurtzberg. As such it can go in a lot of different directions. Do the French go over the hill? or via the Fulda Gap?
These sorts of games are quite open and allow for some genuine strategic insight, bluff and operational planning debate.
If you are interested hit the above link.