Long ago, the imperial civilazation in the west erected giant fortresses to protect themselves from the barbaric tribes in the east, all was well for 10 years until the barbarians in the west allied themselves with the the barbaric tribes of the east in an attemp to launch a joint assult against the imperial empire. After 10 years of war, the only haven that was left for the once mighty empire was one of their most fortified installments, a tall castle protected by a ravine that runs across the castle's width and was virtually impossible to cross by any man or machine. This is where the story begins, your actions will save the hopes of a empire, or damn its many citizens to hell.  The choice is yours.