Model of Lt. Koehler seen here making design notes for his new invention, the depressing carriage which was used with great effect during the Great Siege. (Upper Galleries)

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Fig. 1: Gibraltar Garrison Library.
Fig. 2: © National Maritime Museum, Greenwich, London.
Fig. 4: King’s Own Royal Regiment Museum, Lancaster.
Fig. 5: Courtesy of the Council of the National Army Museum, London.
Fig. 6: Courtesy The Convent, Gibraltar.
Fig. 7: © This image is reproduced courtesy of the National Library of Ireland EP BOYD-RO(i) iii.
Fig. 8: © National Maritime Museum, Greenwich, London
Fig. 9: © Madrid, Museo Nacional del Prado.
Fig. 11: ©Museo Naval de Madrid, 434.
Fig. 12: © Museo Naval de Madrid, 466.
Fig. 13: © Musée municipal de Pontarlier.
Fig. 14: Acknowledgement: Courtesy of the Council of the National Army Museum, London.
Fig. 17: Courtesy of Gibraltar Museum.
Fig. 18: © Osprey.
Fig. 19: Courtesy of the Royal Artillery Historical Trust.
Fig. 20: Courtesy Gibraltar Museum.
Fig. 21 © National Maritime Museum, Greenwich, London.
Fig. 22: © National Maritime Museum, Greenwich, London.
Fig. 23: © National Maritime Museum, Greenwich, London.
Fig. 24: Courtesy Gibraltar Garrison Library.
Fig. 26: Courtesy Gibraltar Museum.
Fig. 27: www.metmuseum.org.
Fig. 28: Courtesy Gibraltar Museum.
Fig. 30: Courtesy Anne S.K. Brown Military Collection, Brown University Library.
Fig. 32: Courtesy Gibraltar Garrison Library.
Fig. 34: David Rowlands.
Fig. 36: Courtesy of the Council of the National Army Museum, London.
Fig. 37: ©Tate, London 2015.
Fig. 38: Acknowledgement: National Maritime Museum, Greenwich, London.
Fig. 39: Courtesy of the Council of the National Army Museum, London.
Fig. 40: Acknowlegement: National Maritime Museum, Greenwich, London.