In bygone days it is said a battle had been fought near Slidderie Water between Fionn’s forces and some others. A great many were slain and buried near the field of slaughter.
This had become a dreaded place by the natives, as it was said to be haunted, owing to the ground having been tilled, which disturbed the rest of these dead warriors.
The shades of the dead that traversed these quiet regions in the lone hours of night were awesome in the extreme, and had evidently been visible not only to persons but also to animals; and the following instance is related.
A certain man had been on the road with his horse and cart, when without warning the horse stood still and would proceed no farther. His ears stood up, while he snorted and was sweating from evident fear. The reason of this soon became known, for there rose before the man’s vision like as it were a small cloud or mist, which grew larger and larger till it became a great size, but it was not only a cloud; whether in it or of it the cloud had taken an uncanny form of a wraith.
This man had met this unwelcome thing more than once.
In The book of Arran, volume 2, by W.M. Mackenzie (1914), p252.