'Dunkirk' Trailer: Tom Hardy, Cillian Murphy, Harry Styles Go to War

Mark Rylance and Kenneth Branagh are also featured in the Christopher Nolan WWII film.

The first official trailer of Christopher Nolan's Dunkirk has arrived, previewing the action in the WWII movie. 

The Warner Bros. film centers on the British military evacuation of the French city of Dunkirk in 1940, one of the biggest battles during the war.

Tom Hardy, Mark Rylance, Cillian Murphy, Kenneth Branagh and Harry Styles are among the featured cast. 

Dunkirk, shot on 65mm large-format film and Imax, hits theaters July 21.