Kathleen Wiltshire, in her ‘More Ghosts and Legends of the Wiltshire Countryside’ spoke to a young couple who had experienced something there in September 1973. They were walking there one evening when suddenly a mist came down. As it got thicker they saw several trotting white horses. ‘A strange atmosphere prevailed’ and both the young people felt very scared. The horses disappeared into the mist, and slowly this too disappeared.
White horses are rather a Celtic motif, if you would like to read that into the story.