The battle of Traigh Ghruineard in 1598 was the last big Clan battle to be fought in the Island of Islay, and it was between Sir Lachlan Mor MacLean, the 14th Chief of Duart and his nephew Sir James MacDonald of Islay.
They fought over possession of the Rhinns in Islay which Lachlan Mor claimed was the dowry given to his wife in 1566 by her brother Angus MacDonald, chief of Clan Donald South, and the most powerful branch of Clann Dhomhnuill. Later, MacDonald gave the land of the Rhinns to Brian Vicar MacKay, lieutenant to the MacDonalds, and for years MacLean had demanded the return of the Rhinns to his wife.
At long last MacLean decided that the only way to settle things was to invade Islay and do battle with Angus' son James.
At that time no chief would go into battle without consulting a ban-fhaidh (wise woman) and this MacLean did. He was very annoyed when she told him not to go to Islay, and when he insisted that he was honour bound to go she closed her eyes, and raising her hands intoned this warning: "In spite of my plea you will set sail for Islay, do not arrive on a Thursday, do not fight on the shores of Loch Gruineard, do not drink from the well known as Tobar Niall Neonaich (the well of strange Niall) or else you will surely die."