Army Of The Dead (2008)

Director: Joseph Conti
Genre: Action, horror

When a professor and his students set out to do some archeological fieldwork, they had no idea what was waiting for them. Their aim was innocent enough, but once their picks hit the dirt they unwittingly unleashed an army of dead warriors. But who are these walking skeletons and why are they so angry? Could these be the same men who disappeared back in 1590 while searching for the lost city of gold?...

http://www.imdb.com/title/tt0478855/