From the orders of April 24th and 25th it would appear that it was Washington's original intention to give the Brooklyn command, not to Greene, but to Sullivan. The latter was assigned to the Third Brigade before going to Canada, and on the 25th the encampment of this brigade was ordered to be marked out "upon Long Island." The fact that Sullivan was senior to Greene in rank, and was entitled, as between the two, to the honor and responsibility of the separate command, was doubtless the ground of his assignment in this case. But a greater responsibility was reserved for Sullivan in Canada, and Greene was sent to Long Island. Owing to bad weather, it was the 3d or 4th of May before the latter crossed with troops. He took with him his old brigade, consisting of Colonel Edward Hand's Pennsylvania Riflemen, his two favorite Rhode Island regiments under Colonels James Mitchell Varnum and Daniel Hitchcock, and Colonel Moses Little's regiment from Massachusetts. These ranked as the First, Ninth, Eleventh, and Twelfth of the Continental Establishment, and were as well armed and under as good discipline as any troops in Washington's army. Hand's regiment, numbering four hundred and seventy officers and men, was already on Long Island, having come from Boston in advance of the brigades, and was engaged in scouting and patrol duty at the Narrows and along the coast. Varnum's, Hitchcock's, and Little's, having an average strength of three hundred and eighty each, were the only troops around Brooklyn.[31] The Long Island militia were not as yet in the field, and the small company of Brooklyn troopers under Captain Waldron and Lieutenant Boerum, which had patrolled the coast during the early spring, do not appear on duty again until late in the season.
It now remained for these regiments to go on fortifying the water-front of this site to keep the ships out of the river, and, in addition, to secure themselves against an attack by land. What Lee's plan was in reference to Columbia Heights has already been seen. Here he proposed to establish a camp with Fort Stirling and the Citadel among its defences, the former of which had been nearly completed and the latter begun by Ward's regiment and the inhabitants. In consequence, however, of a move made by General Putnam soon after his arrival, it had evidently become necessary to enlarge this plan. Governor's Island, just off the edge of which were moored the British men-of-war, had not been occupied by either Lee or Stirling; but it lay within cannon-shot of the Battery and Columbia Heights, and an enemy once lodged there could work us mischief. General Putnam noticed its position, and he had not been here three days before he wrote, April 7th, to the President of Congress: "After getting the works [in New York] in such forwardness as will be prudent to leave, I propose immediately to take possession of Governor's Island, which I think a very important post. Should the enemy arrive here, and get post there, it will not be possible to save the city, nor could we dislodge them without great loss."[32] On the very next night he carried out his proposal, as appears from the following account of the manœuvre preserved among the papers of Colonel G. Selleck Silliman, of Fairfield, Connecticut, who had recently come down to relieve the troops under Ward and Waterbury:
"Tuesday Morning, 9th April.—Last Evening Draughts were made from a Number of Regiments here, mine among the Rest, to the Amount of 1,000 Men. With these and a proper Number of Officers Genl Putnam at Candle lighting embarked on Board of a Number of Vessels with a large Number of intrenching Tools and went directly on the Island a little below the City called Nutten [Governor's] Island where they have been intrenching all Night and are now at work, and have got a good Breast Work there raised which will cover them from the fire of the Ships; and it is directly in the Way of the Ship coming up to the Town. The Asia has fallen down out of Gun Shot from this Place and it deprives the Ships of the only Watering Place they have here without going down toward the Hook."[33] There was something of the Bunker Hill flavor about this move, and it was Prescott's Bunker Hill regiment that was first stationed[34] on the Island, which subsequently became one of the strongest posts of the position. At the same time another party occupied Red Hook,[35] on Long Island, which commanded the channel between the Hook and Governor's Island.
The occupation by Putnam of these two points, which was clearly necessary for a more effective defence of the East River, required, or at least resulted in, the modification of Lee's plan, and the adoption of a new line on Long Island. It was now decided to hold the Brooklyn peninsula with a chain of works thrown up across the neck from Wallabout Bay to the Gowanus Marsh; and it was in this vicinity that the encampment for Greene's brigade was marked out by Mifflin, the quartermaster-general, and afterwards approved by Washington.[36] By the fortunate recovery of the daily orders issued by General Greene on Long Island, and also of original sketches of the site, it has become possible to fix the location of this line and the names of the works with almost entire accuracy.
To defend the approach between the bay and marsh, the engineers laid out three principal forts and two redoubts, with breastworks connecting them. The site occupied was a favorable one. On the left rose the high ground, now known as Fort Greene Place or Washington Park, one hundred feet above the sea-level; and on the right, between the main road and the marsh, were lower elevations on lands then owned by Rutgert Van Brunt and Johannes Debevoise. The flanks were thus well adapted for defence, and they were near enough each other to command the ground between them. Two of the works were erected on the right of the road, and received the names of Fort Greene and Fort Box; three were on the left, and were known as the Oblong Redoubt, Fort Putnam, and the redoubt "on its left." In view of the fact that local historians heretofore have put but three fortifications on this line, where, it is now well established, there were five, a more particular description of them becomes necessary. Extending from right to left, they were laid out as follows:[37]
Fort Box.—It has been supposed that the fort by this name occupied an independent site south-west of the main line, with the object of defending Gowanus Creek where it was crossed by a mill-dam. That it stood, however, on the right of the line is beyond question. Thus the letter of a spectator of the battle[38] says: "Our lines fronted the east. On the left, near the lowest part of the above-described bay [Wallabout], was Fort Putnam, near the middle Fort Greene, and towards the creek Fort Box." In his order of June 1st, General Greene directs five companies to take post "upon the right in Fort Box;" and on August 16th a fatigue party is detailed "to form the necessary lines from Fort Box to Fort Putnam," clearly indicating that the two were on the same continuous line. To confirm the correctness of this locality, we have the fort and its name distinctly indicated on the [outline map] sketched by President Stiles, of Yale College, in his Diary of Revolutionary Events. By reference to the fac-simile of the sketch here presented, it will be seen that although there are errors in the drawing, the relative position of the principal works is preserved, and the site of Fort Box finally determined. It stands nearest Gowanus Creek, and on the right of the other forts. The work appears to have been of a diamond shape, and was situated on or near the line of Pacific Street, a short distance above Bond.[39]