I like that one, too. Here it is called: Live.Die.Repeat
I have watched "They Shall Not Grow Old"
They Shall Not Grow Old is a 2018 documentary film directed and produced by Peter Jackson. The film was created using original footage of the First World War from the Imperial War Museum's archives, most previously unseen, all over 100 years old by the time of release. Audio is from BBC and Imperial War Museum (IWM) interviews of British servicemen who fought in the conflict. Most of the footage has been colourised and transformed with modern production techniques, with the addition of sound effects and voice acting to be more evocative and feel closer to the soldiers' actual experiences.
If you're interested in that history, this is a must see. But it is also a very unpleasant reminder of the sheer horror that was or is going on in war. Many images you might not want to see. And all those young kids...damn. Really well produced and told, a very special documentary.