"Dunkirk" trailer

The first full-length trailer for "Dunkirk" dropped this afternoon. It shows Christopher Nolan's all-star cast in action for the first time. Mark Rylance, Kenneth Branagh, Tom Hardy and Cillian Murphy star in the World War II epic, while Harry Styles debuts his acting skills.

One dramatic scene sees Harry flailing around under the water after his boat capsizes in the sea.

Rylance recently compared Harry to Sean Penn. Asked if he had given the singer any advice, he said: "No, he doesn't need tips. He is shaping up."
The film tells the story of WW II, where a large number of allied soldiers were cut off and surrounded by the German army, and rescue mission Operation Dynamo - otherwise known as the Dunkirk Evacuation - occured between May 26 and June 4 to save them.

Gemma, Harry's sister, tweeted: