I saw a really weird World War I movie on YouTube today, a British movie called Deathwatch.
Set in 1917, the story is about a bunch of British soldiers who go over the top and charge a German trench. All hell breaks loose, and soon this weird fog comes down. The soldiers suddenly find themselves wandering in a forest, and night has become day. They find their way to a deserted trench, full of corpses, and capture a German soldier, who babbles about "evil" and "demons". The soldiers can find no one else around and when they use a crystal radio (an anachronism, as crystal radio did not exist until the 1920's) to try and contact their base, they hear that their whole company was wiped out in the charge. As the movie progresses, it gets weirder and weirder, and it turns out that the German prisoner is not what he seems.
This is a good movie, I recommend it.