The presence of the British in Staten Island wasn’t a big mystery, but within a month after they first arrived, the number of ships in New York Harbor was well over 100, and still growing.

And, as George Washington suspected (along with many others), the British began moving up the rivers surrounding Manhattan, working their way up the Hudson River in the effort to use New York as a wedge between New England and the rest of the colonies. Specifically, if supplies couldn’t get through, then it weakens both sides of the line.

As for New York itself, part of Washington’s problem was that he didn’t know if the British plan was to take New York City (still a small chunk of Manhattan Island at that time), or to move through Long Island. As a result he had to hedge the bet a little bit and send troops in both directions, spreading the Continental Army rather thinly. This may have forced the British to do something quite similar, but they still had Washington vastly outnumbered.

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