The Battle of Tràigh Ghruinneart, fought on 5 August 1598 on the broad sands of Gruinart Strand, was a decisive clash between the MacDonalds of Islay, based at Dunyvaig, and the MacLeans of Duart who were based on Mull. It was one episode in the violent rivalries that followed the collapse of the Lordship of the Isles in 1493, as leading Hebridean clans competed for dominance amid increasing intervention by the Scottish Crown.
 

By the late sixteenth century, the MacDonalds of Dunyvaig were struggling to retain their traditional authority in Islay and Kintyre. Their rivals, led by Sir Lachlan Mor MacLean, sought to extend MacLean influence into Islay, seemingly with some degree of royal approval. Against him stood Sir James MacDonald, determined to defend his family’s lands and status. The confrontation at Gruinart was the
culmination of mounting tension and competing territorial claims.
 

Sir Lachlan Mor landed with a sizeable force, intending to subdue the island. The armies met near the shore, where fighting appears to have been intense and close-quartered. The engagement ended in a clear MacDonald victory. Several MacLeans took refuge in the nearby Kilnave Chapel but the MacDonalds set fire to the roof, killing all but one inside. Lachlan Mor himself was killed, and his followers forced to retreat, dealing a blow to MacLean ambitions in Islay.
 

Local tradition associates the battlefield with the legend of the Dubh Sith (“Black Fairy”), who initially offered Lachlan Mor support but was mocked. He later hid in a tree and, when Lachlan Mor removed his helmet, the Dubh Sith fatally shot him with an arrow. While such stories are deeply embedded in Islay’s oral heritage and contribute to the atmosphere surrounding the site, they belong to the realm of legend rather than verifiable history.
 

Although the battle secured a temporary resurgence for the MacDonalds in Islay, it did not end regional instability - indeed, a further battle followed weeks later.