1917 is Mendes’s most purely ambitious and passionate picture since his misunderstood and under-appreciated Jarhead of 2005. It’s bold, thrilling film-making.

1917 is an expertly crafted and emotionally exhausting thrill-ride behind enemy lines. Gloriously shot, deftly paced, and striking in its gruesome recreation of the time and place, Sam Mendes’ 1917 wisely never loses sight of the smaller, intimate elements in a fast-paced story with immense scale and action.

The film belongs to Chapman and more than anyone, MacKay, a 27-year-old Londoner with the long bones and baleful eyes of a porcelain saint or a lost Caulkin brother. His Lance Corporal Schofield isn’t just a surrogate Everyman; he’s hope and fear personified, and you couldn’t look away if you wanted to.

Even if the film is mostly hitting familiar notes in terms of story and theme, it expresses a concise, focused and expertly managed vision with which there’s little to quibble, and the extraordinary style represents the fruition of a long-imagined dream on the part of many directors and cinematographers. From now on, when the discussion turns to great works of cinematography and camera operating, 1917 will always have to be high on the list.

Mendes is intent on bringing a sense of breathless derring-do to a war only known for its doomed futility. And he loads onto it a one-take challenge, a rolling-back and slowly-swerving camera, using the sleight of hand which distinguishes the best action cinema of this kind.