"Wo alle Straßen enden" is an German marching song. The video has WWI footage showing the reality of the trenches.
https://youtu.be/A_45_19b9Hg?si=auCx4B6wFFGrJ3Hb
there's more movie clips than actual WWI footage in there
alt Hacker News
there's more movie clips than actual WWI footage in there