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Fort Arsenal

Fort Arsenal was a stronghold, which was claimed by Shay Cormac after saving Christopher Gist from execution, in June 1756.
History
In 1756, Shay Cormac was ordered by George Monro to rescue Christopher Gist, a Templar from hanging.
Upon arriving, Shay fought the Assassins in the fort, and succeeded saving Gist, and Gist told Shay about the Morrigan being anchored in the Fort's dock.
Together, Shay and Gist freed her from stalkers, loyal to the Assassins. After the event, Shay Cormac claimed the Fort for himself, and the Morrigan once again.
Trivia
In Assassin's Creed III, the fort was not present in New York . It was either destroyed, or it was a map-goof.
Gallery

Reference