The Battle of Drumchatt of 1497 is recorded in several recognised historical documents including the MacDonald MS history and also in several published books, including Sir Robert Gordon's A Genealogical History of the Earldom of Sutherland (1625) and Donald Gregory's History of the Western Highlands and Isles of Scotland (1835).
From Donald Gregory's History of the Western Highlands and Isles of Scotland from AD 1493 to AD 1625, quoting Gordon.