The Campaign of 1776 around New York and Brooklyn / Including a new and circumstantial account of the battle of Long island and the loss of New York, with a review of events to the close of the year

by Henry Phelps Johnston

"Gens. Putnam and Mifflen have made an exact Survey of the River opposite Mount Washington and find that the Depth in no Part exceeds seven Fathoms; the Width, however, of the Channel (which is from three to seven Fathoms) is not much less than 1800 Yards, the shallow Part of the River running in an oblique Direction. Genl. Washington expresses himself extremely anxious about the Obstruction of that Channel, and Measures are daily used for executing that Purpose. It is impossible to procure Vessels enough at New York, so that the Measure must be delayed till such Time as more Vessels can be brought through the Sound from Connecticut; however, I am not without Apprehensions that this Resource will be cut off, as I understand that some of the Enemy's Vessels have sailed out of the Hook with an Intention (probably) of cutting off our Communication with the Sound.

"It is, however an Object of so much Importance that no Difficulties, however great, ought to deter us from our Attempts to carry it into Execution; if we succeed, the Designs of the Enemy in this Campaign are effectually baffled—if we fail, we cannot be in a more lamentable Situation than we are now.

"Exclusive of the great Advantage we should reap in obstructing the Channel so far to the Southward, it is, I fear, the only Place we can depend upon shallowing to the Southward of the Highlands, whilst the Men-of-War are in the River, for if proper Batteries are erected near the Water at Mount Washington, and on the opposite Side, mounted with Guns of 18, 24 and 32 Pounders, it will not be practicable for any Vessels to be so near as to prevent our working under the Cover of these Works. I have strongly urged Genl. Washington to send Gen. Mifflen some heavier Metal, and he seems half inclined. This necessary operation has not yet taken place.

"The Genl. is anxious to have either of you (as Members of the Secret Committee) to be with him in Town, and has authorized me to make the Offer to you of his House during your Residence. Let me entreat One of you immediately to come Down, and not to quit Genl. Washington till such Time as this Measure on which our Safety depends is effected....

"I am very sincerely, yours, etc.,
"WM. DUER.

"P.S.—For God's sake exert yourself to secure the Sea Vessels which are in the River."[228]

To hasten the completion of the obstructions General Putnam proposed the following plan of sinking ships, as appears in a letter from him to General Gates, dated July 26, 1776 (in Sparks'):

"We are preparing Chevaux-de-Frize, at which we make great Despatch by the Help of Ships, which are to be Sunk; a Scheme of mine, which you may be assured is very simple, a Plan of which I send you. The two Ships' Sterns lie towards each other, about Seventy Feet apart. Three large Logs, which reach from Ship to Ship, are fastened to them. The two Ships and Logs stop the River two hundred and eighty Feet. The Ships are to be sunk, and, when hauled down on one side, the Picks will be raised to a proper Height, and they must inevitably stop the River, if the Enemy will let us sink them."

On the 21st of September, the New York Convention resolved:

"That the Secret Committee for obstructing the Navigation of Hudson's River be empowered and directed to purchase or impress for the Service of the State any Number of Vessels not exceeding six, which they shall think best calculated for the Purpose of completing the Obstructions in the Hudson's River opposite to Mount Washington....