The work of Somhairle MacGill-Eain (Sorley MacLean), the greatest Gaelic poet of the 20th century, has a significance which echoes far beyond the confines of his time, his country and his language. His extended political poem \'An Cuilithionn\' (\'The Cuillin\'), taking the celebrated mountain range in Skye as a symbol for the international revolutionary movement, has hitherto been known only in an abridgement, made fifty years after its initial conception in 1939 on the eve of World War II. Christopher Whyte\'s edition of the original manuscript includes 400 lines never before published, along with MacLean\'s own English translation from the time of writing, and an extended commentary. Forty-five other previously unpublished poems by Sorley MacLean also appear here for the first time, with facing English translations.