Skeleton Man

Skeleton Man is a 2004 Sci Fi Pictures original film. It was directed by Johnny Martin, and stars Michael Rooker and Casper Van Dien. In this movie, the titular Skeleton Man stalks a squad of soldiers.

Skeleton Man, now on horseback, kills a soldier and chases his partner. Before being killed, the second soldier manages to record a video and send it back to his bosses. They receive it and send in Delta Force to deal with this unknown threat.As they advance, a female soldier falls behind and is impaled through the chest. The team finds an old Indian man who tells them that Skeleton Man, known as Cottonmouth Joe, was a genocidal warrior who killed the old mans tribe and is now stalking the soldiers. The team pays him no heed. ........

Source: Wikipedia