The Chiefs of Duart were among the most powerful and influential chiefs in the Highlands. Their power was absolute, bearing the control of neither King nor Parliament, and there are many stories shewing that they were very unsparing in visiting with their vengeance, and even taking the lives of those who offended them. A very notorious sea-robber and land plunderer of whom there are many tales in the Isle of Skye raised a creach, or cattle-spoil, from MacDonald Lord of the Isles, who then occupied a fort on the site of the present manse of Kilchoman in Islay. He managed also to circulate a report that it was the MacLeans from Mull who were the depredators. At that time MacLean, Duart, was ambitious to be overlord of a great part of Islay, and Lachunn Mòr came with a band of followers to Gruinard beach in the neighbourhood of the fort. It is said that before leaving Mull, he was standing on the roof of Aros Castle which overlooks the Sound of Mull and on its being pointed out that an expedition to Islay would be very dangerous to his men, he said, that he did not care though there should not be a MacLean in Mull except those descended from himself. Neither he himself nor his men came back from the ill-fated expedition. After landing at Gruinard beach (Tràigh Ghrunnard) he was met by the MacDonalds. A little man, known in tradition as the Black Elf (Dubh Sith) and (Ochd-rann bodaich), or eighth part of a man[In Scotch the eighth part would be the lippie used for measuring grain and meal. According to the table to be found in old Reckoning Books a boll consists of two pecks and each peck of four lippies. This makes each lippie equal to an eighth part of a boll],offered his services for the battle to MacLean, but the haughty Chief rejected the offer with disdain. The Black Elf then went to MacDonald, who accepted his offer; and during all the current of the heady fight the dwarf was observed to follow MacLean for an opportunity to kill him with an arrow. An opportunity having at last occurred by MacLean lifting his arm, an arrow was launched and MacLean was pierced on the side, and fell with a deadly wound. Having lost their Chief the MacLeans were routed with loss, and those who escaped from the battle, having taken refuge in a neighbouring church, were destroyed by the MacDonalds, who set the church on fire. The body of Lachunn Mòr was taken on a sledge, there being no wheeled vehicles in those days, to Kilchoman burying-ground. Some say that the person who took him was his wife, and others say it was his foster-mother. His head from the motion of the sledge nodded in a manner that made the boy who accompanied her laugh. She was so much offended at his ill-timed merriment that she took a sword and killed him on the spot. The site of this tragedy in Benviger is still pointed out and the place where Lachunn Mòr himself was buried is known to the people of the place although no headstone marks it.