IT IS A TOTAL MYSTERY how 266 British Soldiers disappeared without a trace during the Battle of Gallipoli during WWI in 1915.
Here is what cassiopaea.org say about it:
One of the strangest occurrences of the entire First World War – the disappearance of an entire regiment of men in the midst of battle during the infamous Gallipoli campaign. The incident came to light mainly through the eyewitness account of three members of a New Zealand field company, who said that they watched from a clear vantage point as a battalion of the Royal Norfolk Regiment marched up a hillside in Suvla Bay, Turkey. The hill was shrouded in a low-lying mist that the English soldiers marched straight into without hesitation. They never came out. After the last of the battalion had entered the mist, it slowly lifted off the hillside to join the clouds in the sky. When the Great War was over, assuming that the battalion had been captured and held prisoner, the British government demanded that Turkey return them. The Turks insisted, however, that they had neither captured not made contact with these English soldiers and ever since then theories have abounded as to their fate.

I don’t think there is anyway to explain this as rational but there are other ways. To me I think the most obvious is a mass UFO abduction. There have been sightings of UFOs describd as clouds before and we know UFOs abduct people so why not. I would love to go here and investigate the site of the disappearence. It would be an amazing investigation. -Mort