10. The straits have successfully been forced by ships at least three times: in 326 by a Roman Fleet under the 17 year old admiral Crispus, in 1654 by a Venetian Fleet, and in 1807 by a British fleet under Vice Admiral Sir John Duckworth. See Cook, Stanley A., Adcock, Frank, Charlesworth, M. P., The Imperial Crisis and Recovery, AD 193-324, Cambridge, Cambridge University Press, 1939; Clowes, William Laird, The Royal Navy. A History from the Earliest Times to the Present. Volume V, London, Sampson, Low, Marston and Company, 1900, pp. 218-230