The first footage from Christopher Nolan’s forthcoming war drama Dunkirk has been released. The minute-long "announcement" teaser is due to debut in cinemas with Suicide Squad and has now appeared online after an earlier leak.

Both movies are being distributed by Warner Bros., and it feels fitting that the trailer for a film by Nolan – whose Batman trilogy is widely seen as one of the best DC superhero adaptations of recent years – would precede the studio's latest comic-book adventure.

In tone, however, the two films couldn't be more different. Dunkirk, which stars Tom Hardy, Mark Rylance, Cillian Murphy and Kenneth Branagh, tells the story of the Miracle of Dunkirk, in which a fleet of British ships and boats – many of them manned by volunteers – rescued stranded Allied troops from a French beach.