The first siege of Fort Augustus, at the SW end of Loch Ness, Scotland, took place in December 1745 and was part of the Jacobite rising of 1745.

[2] The Clan Fraser had originally supported the British Government during the Jacobite rebellion of 1715–1716.

Shortly after the siege of Fort Augustus, Lord Loudoun with 600 men of the Independent Companies of Sutherland, Mackay, Grant and Munro went in search of Simon Fraser, 11th Lord Lovat who was the chief of Clan Fraser.

[1] Lord Lovat had allowed his son to go off with a band of Frasers to join the Jacobite leader Prince Charles.

[1] However Lord Lovat, who had originally agreed to this move, escaped from his home at Castle Downie, evading capture.