VIDEO: George MacKay Previews 1917 on THE TONIGHT SHOW WITH JIMMY FALLON

George MacKay talks about becoming a known "unknown" with the success of his film, 1917, and he describes the six months of rehearsal and tricky choreography that went into creating realistic-looking battle scenes.

Watch the interview on "The Tonight Show With Jimmy Fallon" below!

The Tonight Show Starring Jimmy Fallon features hilarious highlights from the show, including comedy sketches, music parodies, celebrity interviews, ridiculous games, and, of course, Jimmy's Thank You Notes and hashtags!