Fort-WILLIAM, a fortress in the Highlands of Scotland, erected in King William's reign, as was also a small town adjoining, called Maryburgh, in honour of his queen. It is situated in Inverness-shire, on a narrow arm of the sea called Loch Eil, which by the completion of the Caledonian canal, will be united to the Western sea. Fort-William is of a triangular form, having two bastions, and is capable of admitting a garrison of 800 men; but could not be defended against an attack, as it is commanded by several hills in the neighbourhood.