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This fortification was one of a line running diagonally across the northern end of Manhattan Island from Fort Laight in the north to the Halletts Point Tower in the south. Included in the line from north to south were Fort Laight, NYC Blockhouse No. 3, NYC Blockhouse No. 2, NYC Blockhouse No. 1, Fort Fish, Fort Clinton (4), Mill Rock Fort, Fort Stevens (5) and the Halletts Point Tower. These fortifications were located on line of bluffs in the north that overlooked the landside approaches and the major roads into New York City. The southern end of the line guarded McGowans Pass along the Old Post Road and the back door water approach to New York City via a treacherous stretch of water known as Hell Gate.

In addition to these major fortifications, a number of gun batteries and smaller redoubts were located at strategic points to reinforce and protect specific areas. Often these fortifications were connected by earth works and trenches.