A 19th century engraving of a 16th century drawing, showing the works at Tilbury in preparation for the Spanish Armada in 1588, probably to the design of Italian engineer, Federigo Giambelli (or Genibelli). The original D-shaped blockhouse can be seen in the front and centre of the fort.
Unknown (1843)
2015-03-01
Cruden, Robert Peirce (1843), <i>The History of the Town of Gravesend</i>], William Pickering, London (p, 246) (<a rel="nofollow" class="external free" href="https://archive.org/stream/historyoftownofg00crud#page/n269/mode/2up">https://archive.org/stream/historyoftownofg00crud#page/n269/mode/2up</a>)