The movie, which features a star-studded cast of just about every acclaimed British actor around, centers on on two young British soldiers on a single day at the height of WWI.
The two soldiers, Schofield (George MacKay) and Blake (Dean-Charles Chapman), are given a seemingly impossible mission. In a race against time, they must cross enemy territory and deliver a message that will stop a deadly attack on hundreds of soldiers—Blake’s own brother among them.
This is Mendes' first film since directing 2015's James Bond movie "Spectre." He is reuniting with legendary cinematographer Roger Deakins; the pair previously worked together on "Skyfall," "Jarhead," and "Revolutionary Road."
"1917" opens in limited release December 25 and in wide release January 10.