George MacKay & Dean-Charles Chapman talk '1917,' their friendship and Sam Mendes

George MacKay and Dean-Charles Chapman, who star in Sam Mendes' World War I film '1917,' talk about their experience working on a one-shot film, and their rehearsal process. They reveal the one piece of advice Sam gave them, and dish on which historical event they would have liked to witness. They also talk about their friendship, which involved making poached eggs!
'1917' opens in theatres January 10, 2020.