Steam has a free demo of Mount & Blade, a little known RPG/wargame. Be warned, there are limitations and some learning curve, but there's nothing else really like it. You can see some videos on youtube to get an idea. Start with this one if you are interested in horseback combat and raising your own army: http://www.youtube.com/watch?v=Mgb8D6aYzGI

http://mountandblade.scarletsabers.c...anualEU_1_.rar for a copy of the manual.

http://www.paradoxplaza.com/Mount&Blade/ for the offical website.