3. In The Bottom Of These Marshes, And Close To The Edge Of The River, Stands The Strong Fortress Of Tilbury, Called Tilbury Fort, Which May Justly Be Looked Upon As The Key Of The River Thames, And Consequently The Key Of The City Of London.

It is a regular fortification.

The design of it was a pentagon, but the water bastion, as it would have been called, was never built. The plan was laid out by Sir Martin Beckman, chief engineer to King Charles II., who also designed the works at Sheerness. The esplanade of the fort is very large, and the bastions the largest of any in England, the foundation is laid so deep, and piles under that, driven down two an end of one another, so far, till they were assured they were below the channel of the river, and that the piles, which were shed with iron, entered into the solid chalk rock adjoining to, or reaching from, the chalk hills on the other side. These bastions settled considerably at first, as did also part of the curtain, the great quantity of earth that was brought to fill them up, necessarily, requiring to be made solid by time; but they are now firm as the rocks of chalk which they came from, and the filling up one of these bastions, as I have been told by good hands, cost the Government 6,000 pounds, being filled with chalk rubbish fetched from the chalk pits at Northfleet, just above Gravesend.

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