Passage: In 2011, Relativity Media released a biopic about Childers entitled Machine Gun Preacher, which was based on Childers' book Another Man's War. The film was written by Jason Keller and directed by Marc Forster. The cast featured Gerard Butler in the title role, Michelle Monaghan as Childers' wife Lynn, and Michael Shannon as his best friend Donnie.

Question: When was the biopic Machine Gun Preacher released?
2011