In the Highlands it was a law, that if a robber was sheltered from justice, any man of the same clan might be taken in his place. This was a kind of irregular justice, which, though necessary in savage times, could hardly fail to end in a feud, and a feud once kindled among an idle people with no variety of pursuits to divert their thoughts, burnt on for ages either sullenly glowing in secret mischief, or openly blazing into public violence. Of the effects of this violent judicature, there are not wanting memorials. The cave is now to be seen to which one of the Campbells, who had injured the Macdonalds, retired with a body of his own clan. The Macdonalds required the offender, and being refused, made a fire at the mouth of the cave, by which he and his adherents were suffocated together.
– Samuel Johnson, A Journey to the Western Islands of Scotland (1775).