Since the GNW was covered...maybe Napoleon's Russian campaign? Or just a general 'Napoleonic' campaign.

For something more obscure, perhaps a campaign about the partition of Poland? Sure it was historically pretty one-sided (from the Polish point of view, anyway :P), but it might be interesting to do some alternate history there.

For the Americans (and Texans) maybe a Texas Revolution mini-campaign? I think that'd be really great, myself. Remember the Alamo!