Curse of the Cannibal Confederates by Tony Malanowski

2.40

Three young couples head off into the woods for a weekend of camping, beer-guzzling, and love-making. Shortly into their trip, however, they stumble across a Civil War cemetery, making the ill-fated decision to pocket an old diary hidden at the site, which triggers a horde of rotting, undead soldiers to awaken from their tortured slumber.