I'd love to have commemorated the 200th anniversary of the Battle of Raszyn by announcing that Jean-Michel Mathe had finally finished his Napoleonic opus HistWar: Les Grognards. Sadly I can't (he's still drilling his TacAI and personally sharpening and polishing every single sabre and bayonet in the game) so instead I'll mark the day by drawing your attention to a darling chunk of much lighter Nap strategy.
PeG - Napoleonic is based on the People's General engine and has the kind of Battle For Wesnothian charm that wargame devs don't seem to be all that good at anymore. Free, self-contained, and dead easy to learn especially if you've Panzer Generalled in the past, just about the only aspects that aren't instantly graspable are fog-of-war dispersion (use the cavalry options under the 'air missions' tab to quickly scout the battlefield) and unit capabilities (right click a unit to display stats and access replenishment/resupply). For extra campaigns (though none as yet that include Fifth Coalition scraps like Raszyn) force-march your way to creator Robert Mary's personal depot.