So who's the main lead actor?
Hardy?
shareIt's an ensemble cast which should mean relatively equal screen time for the actors they listed in the press release.
However, they signaled that 19 year old unknown Fionn Whitehead probably has a bigger part by tagging his name on the end of the sentence with the big names.
“Dunkirk” features a prestigious cast, including Tom Hardy (“The Revenant,” “Mad Max: Fury Road,” “Inception”), Mark Rylance (“Bridge of Spies,” “Wolf Hall”), Kenneth Branagh (“My Week with Marilyn,” “Hamlet,” “Henry V”) and Cillian Murphy (“Inception,” “The Dark Knight” Trilogy), as well as newcomer Fionn Whitehead. The ensemble cast also includes Aneurin Barnard, Harry Styles, James D’Arcy, Jack Lowden, Barry Keoghan and Tom Glynn-Carney.
http://www.warnerbros.com/studio/news/filming-has-begun-christopher-nolan%E2%80%99s-epic-action-thriller-dunkirk
Also, some articles like this one called Fionn Whitehead lead:
http://www.slashfilm.com/christopher-nolan-dunkirk-fionn-whitehead/
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It's obvious him being Mel Gibson's son and all. Figured the two of them would combine the world war narrative. Only in Dunkirk a man is saved during the attack. During the battle he dies for a good say 12 minutes. He is guided through time. Almost like it's a wonderful life. Only better.
“God created war so that Americans would learn geography.”
― Mark Twain