was of great strategic significance as the location of major military installations including the dockyard and arsenal at Woolwich, the powder magazine at Purfleet, and the victualling stores and shipyard at Deptford. In addition, it was essential to ensure that an enemy could not make a landing along the Thames, which offered a potential land corridor to London. The crossing between Gravesend and Tilbury was also of considerable importance, which had prompted the Tudors to build fortifications on both sides of the river at that point. The impetus for the construction of New Tavern Fort came from the threat posed by the United Kingdom's adversaries in the American War of Independence - the newly created United States of America and its European allies, France and Spain. Serious weaknesses in British coastal defences had been revealed in 1778 by the American adventurer John Paul Jones in his raid on Whitehaven, Cumbria. The activities of his squadron on the British east coast the following year, along with the failed Franco-Spanish Armada of 1779, prompted the British government to commission a survey of the country's coastal defences. The state of the defences was found to be unacceptably deficient and plans were made for the building of 30 new batteries, positioned in an arc along the southern and eastern English coast from Norfolk to Cornwall. The Thames portion of the survey was carried out by the engineer Thomas Hyde Page. He recommended the refurbishment of the existing Tudor-era Tilbury Fort on the riverbank opposite Gravesend, and the construction of an entirely new fort to replace the older Gravesend Blockhouse, another Tudor-era fortification of which only traces now remain. The new fort would be located to the east of the blockhouse, where it would have a greater reach downriver and would be able to cross its fire with that of Tilbury Fort. With fears increasing of a French invasion in support of their American allies, the government approved Page's proposals and construction began soon afterwards. Construction and early years The fort was constructed between 1780 and 1783 on a site originally occupied by the New Tavern Inn, from which it took its name. As the land was private property occupied by a Mr. Houghton, an Vesting Act (20 Geo. III c.28) was passed to purchase it. It was originally an irregularly shaped unrevetted earthwork consisting of two batteries linked by a rampart. The first battery