The traditions.. which float around this class of the Arran grave mounds [chambered cairns] are associated with the fierce raids and clanish feuds of early times; and it is said that the ghosts of the buried dead were wont to rise from their graves and renew the combat in the shadowy folds of the evening mists.
From p22 of ‘The Antiquities of Arran’ by John McArthur (1861).