From the description at Board Game Geek http://boardgamegeek.com/boardgame/109125/wallenstein-second-edition:
In 1625, the Thirty Years' War is underway, and military leaders like Albrecht von Wallenstein and Gottfried Heinrich Graf zu Pappenheim are roaming the country, fighting for land, and trying to establish the best of everything for themselves. The game lasts two "years," with players taking actions in the spring, summer, and fall, then possibly suffering from grain shortage and revolts in the winter before scoring points for the year. After two years, the player with the most points – with points being scored for land and buildings under one's control – wins.
In each of the "action" seasons, ten action cards are shuffled, then laid out, with five face-up and the rest face-down. The five bonus tiles (which provide extra money, grain, or armies) are also laid out. Each player then secretly assigns one of his county cards (or a blank card) to each of the ten actions on his individual player board, in addition to bidding for player order and choice of bonus tile.
After revealing that round's event card and determining player order, players carry out actions in the order determined earlier, revealing which county is taking the current action, then revealing the next face-down action, thus giving players some information about when actions will occur, but not all. Taxing a county or taking grain from it can increase the chance of a revolt during winter, but without money you can't deploy troops or build palaces or churches and without grain you increase the chance of revolt.
Combat and revolts are handled via a dice tower in which players drop army units and peasants (colored wooden cubes) into the top of the tower and see which ones emerge in the bottom tray (representing the fighting forces for that combat) and which get stuck in the tower's baffles to possibly emerge in the future.