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In the spring of 1778, a heavy chain supported by huge logs was stretched across the Hudson from West Point to Constitution Island, opposite. It was constructed at the Stirling Iron Works, in Warwick, Orange County, and chain links from Long Pond Iron Works in Ringwood, New Jersey. The task was completed in six weeks.
The Hudson River's narrow width and sharp turns at West Point created adverse sailing conditions. The Army took advantage of this by constructing The Great Chain in 1778 as an obstacle to the movement of British ships north of West Point. The distinctive "S-Curve" of the Hudson at this point forced any large ship to tack in order to navigate it.
https://en.wikipedia.org/wiki/Hudson_River_Chain#Great_Chain_(1778%E2%80%931782)
The Hudson River's narrow width and sharp turns at West Point created adverse sailing conditions. The Army took advantage of this by constructing The Great Chain in 1778 as an obstacle to the movement of British ships north of West Point. The distinctive "S-Curve" of the Hudson at this point forced any large ship to tack in order to navigate it.
The saved chain portion was first displayed at the West Point ordnance compound, along with a captured mortar, as shown in the black and white drawing to the right, which was made in 1905.
https://en.wikipedia.org/wiki/Hudson_River_Chain#Great_Chain_(1778%E2%80%931782)
