"This is a powerful film that leaves quite an impression. Gance told the French government that the film could be used as a recruiting tool, so they allowed him to film at the front (he captured part of the Battle of St. Mihiel) and the footage was used in the movie. He was also able to use soldiers on leave as extras in the climactic scene where the dead come back to life. Most of the men used in this scene were in the army and were tragically killed weeks later. Still, they had seen battle in the trenches of France and you can tell by the looks on their faces that they weren't acting so much as reacting to what they had experienced." - John Sinnott, DVD Talk