2011 or 2012 Film With Soldiers in City of Ruins

by Chris
(New Hampshire, USA)

I remember about a year ago seeing a trailer for a movie about a group of soldiers who come upon a city in ruins where there is only one survivor.

They take the survivor (who is supposed to be Satan), and things start to happen to the group, and people die.

It looks really cool, and I want to check it out, but I can't remember the name of the movie. Can anyone help?