Tooth and Nail (2007)

In a post-apocalyptic world, a small group of survivors, who call themselves Foragers, plan to rebuild civilization from their headquarters in an empty hospital based in what is left of Philadelphia. But they're soon forced into a face-off war with the Rovers, another gang of survivors whom are a brutal gang of cannibals. As the Rovers take out the Foragers one by one, the Foragers must draw on all their resources to stay alive.