The clan had a long history of support for the 'Prince over the Water', unlike the Campbells across Loch Fyne, Lachlan Maclachlan the 17th Clan Chief was a staunch
Jacobites, supporting Viscount Dundee at the
Battle of Kiliiecrankie in 1689,
James VIII in the 1715 Uprising. Thirty years later in 1745, hopes were rising of the Young Pretender's imminent arrival on Scottish soil, Charles Edward Stuart unfurled his banner on the shore of
Glen Shiel, the Highland clans were faced with a momentous choice. Many were 'out' for the Prince, while some wavered, doubting the chances of success and keenly aware of the possible consequences. Lachlan MacLachlan rallied 100 men and went Westwards to Holyrood in
Edinburgh. 16 April 1746, Lachlan MacLachlan led a Regiment consisting of 115 MacLachlan's, 182 MacLeans of Mull, whose Chief failed to arrive, into the
Battle of Culloden alongside
Clan Mackintosh and
Clan Chattan. After managing to survive the Hanoverian artillery barrage, the Jacobites launched a fierce offensive against the government lines; However, found themselves outnumbered and retreated towards their lines. Few Clansmen survived, Lachlan MacLachlan himself was a casualty of this battle when he was struck and killed by a cannonball. His body was later found behind Hanoverian lines. Since then,
Old Castle Lachlan has remained uninhabited and has fallen into ruin. In 1748, Rev. John MacLachlan of Kilchoan, in a letter to Rev. Robert Forbes, Bishop of Ross and Caithness, wrote, ''I hope you'll take notice of Collonel MacLachlan of that Ilk, whom the newspapers and magazines neglected. 'Tis true he got but few of his clan rais'd, because most of them are situated amidst the Campbells. However he attended the Prince at Gladsmuir, and march'd with him to Carlyle, from whence he was detach'd by the Prince with an ample commission and 16 horses to lead on to England the 3,000 men that lay then at Perth... ...The Collonel join'd us again at Stirlin, and when we retir'd to Inverness the Prince made him Commissary of the army. At the battle of Culloden he had a regiment of 300 men, whereof 115 were his own people and 182 were Mackleans, who chose to be under his command, seeing their chief was not there. The said Collonel being the last that received orders from the Prince on the field of battle, he was shot by a cannonball as he was advancing on horseback to lead on his regiment, which was drawn up between the Macintoshes and the Stewarts of Appin.'' Through the intervention of the
Duke of Argyll, the lands were returned to Robert MacLachlan, the 18th Chief, on November 18, 1749, then age 14. == Modern history ==