German World War II Colonel Von Stauffenberg was actively involved in the assassination of Adolf Hitler
Christopher McQuarrie visited the memorial to von Stauffenberg and researched more on the July 20 plot to assassinate Adolf Hitler. Christopher was spellbound by the fact that the conspirators knew the complete outcome of the project, and that failure would lead to a terrible death. The team also met Rochus Misch, the last person to leave the bunker when Hitler committed suicide to know a better political landscape during the Final Solution. Memorial to the Gernam resistance helped in the making of the film by providing materials and documentations. The film making team was in constant touch with the German Government to make sure the film is as original as possible.
Stauffenberg played an important role in the military resistance against the Nazi regime and in the [German military's] self-perception [...] A sincere and respectable depiction of the events of the 20th of July and of Stauffenberg is therefore very much in Germany's interest. German Defense Ministry Spokesperson Harald Kammerbauer, June 2007Peter Hoffmann, professor of history atMcGill University and a leading authority on the German Resistance, was a consultant for the filmmakers A detailed version of the July 20th Plot to assassinate Hitler, the real men and true events associated.