Stranger and scarier things than fighter pilots were patrolling the skies above the battlefields of France, according to a new book.
During the First World War soldiers and civilians reported a string of paranormal phenomena that historians and UFO experts have struggled to explain.
So much so that it raises the question, were aliens watching us 30 years before the fabled crash landing at Roswell, New Mexico?
Some of these spectacular sightings feature in a new book, UFOs of the First World War, by Nigel Watson.
The most famous flyer of the First World War was the German pilot Manfred Freiherr von Richthofen, better known as the Red Baron.
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