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*''Historical Record of the Twenty - First Regiment or the Royal North British Fusiliers: containing an account of the formation of the regiment in 1678, and of its subsequent services to 1849'' by Richard Cannon 1849. [http://books.google.com/books?id=cd9VURMLu2gC Google Books]. Indian Service commences [http://books.google.com/books?id=cd9VURMLu2gC&pg=PA48 page 48] in Calcutta in 1839*''Historical record and regimental memoir of the Royal Scots Fusiliers, formerly known as the 21st Royal North British Fusiliers. Containing an account of the formation of the regiment in 1678 and its subsequent services until June 1885'' [http://www.archive.org/stream/historicalrecord00clarrich#page/n9/mode/2up Archive.org]. Indian service commences [http://www.archive.org/stream/historicalrecord00clarrich#page/n79/mode/2up/search/Calcutta page 43] in 1839 in Calcutta