They Shall Not Grow Old

They Shall Not Grow Old is a 2018 documentary film directed and produced by Peter Jackson. It was created using footage of the First World War held by the British Imperial War Museum (IWM), most of which was previously unseen, and all of which was over 100 years old by the time of the film's release. Much of the footage was colourised and restored using modern production techniques for its use in the film, and sound effects and voice acting were added to the silent footage. The film's narration was edited from interviews with British WWI veterans from the collections of the BBC and the IWM.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.