Sengoku is a grand strategy game with an especially tasty map.
You choose one of the territories inside one of the provinces that belong to a clan.
Your goal is to take over the province in which your territory is in, then the clan of which the province is a part of, and eventually take over japan and become Shogun.
you can also start with a Province or even a clan being already yours.
You must conquer new lands and improve existing territories, while fighting to keep your clan in your family's hands.

http://www.youtube.com/watch?v=zftdjLceVFc

If anyone is interested this is a link to an update and a mod that greatly expands on the original game:
http://www.mediafire.com/grandstrategygeneral#y0qo09e99e84g

(in the Sengoku folder).