Redoubt on the Left.—At the eastern termination of the hill, a short distance from Fort Putnam, and on a lower grade, stood the last of the works, which is identified in the orders and letters of the day as the "redoubt on the left." It was a small affair, and occupied a point at about the middle of the present Cumberland Street, nearly midway between Willoughby and Myrtle avenues; but in 1776 the site was twenty feet higher, and appeared as a well-defined spur extending out from Fort Putnam. As it was commanded by the latter, its capture by the enemy would bring them no advantage, while as an American defence it could materially assist in protecting the left.
Between these five works a line of connecting intrenchments was laid out, while on the right it was to be continued from Fort Box to the marsh, and on the left from the Fort Putnam Hill, "in a straight line," to the swamp at the edge of Wallabout Bay. Anticipating their construction, we may say that each work became a complete fortification in itself, being surrounded with a wide ditch, provided with a sally-port, its sides lined with sharpened stakes, the garrison armed with spears to repel storming parties, and the work supplied with water and provisions to withstand a siege if necessary. The greater part of the line was picketed with abattis, and the woods cut down to give full sweep to the fire of the guns. As every thing depended upon holding this front, the necessity of making it as strong as possible was fully realized, and at the time of the engagement in August it was considered a sufficient barrier to the enemy's advance.[43]
Fort Cobble Hill.—Passing to the remaining works on Long Island, we find a redoubt on the crest of a cone-shaped hill, which stood alone near the intersection of the present Court and Atlantic streets, and which was known by the Dutch inhabitants as Punkiesberg. As it does not appear to have been called Cobble Hill before this date, the reasonable inference may be drawn that it was so named by Greene's troops because of its close resemblance to the Cobble Hill which formed one of the fortified points in the siege of Boston, but a short distance from Winter Hill, where Greene's brigade was posted. In the orders of the day, the redoubt is known as "Smith's barbette," Captain William Smith, the engineer whom Lee brought with him, having it in charge. The work mounted four guns, and, from its central interior position, could have prevented the enemy from securing a foothold on the peninsula in the rear or flank of the main line in case they effected a landing back of Red Hook or crossed Gowanus Creek above. This hill was long since cut away.[44]
Redoubt at the Mill.—Near the corner of the present Degraw and Bond streets, a small battery or breastwork, in the form of a right angle, mounting one gun, was thrown up to cover the narrow passage over a mill-dam which here crossed Gowanus Creek. It stood at the extremity of a long low sand-hill, and the dam connected this point with a tongue of land on the opposite side, on which two mills were built, known as the upper or yellow, and lower mills. The upper mill was immediately opposite the redoubt, and it was here that the Port Road came down to the edge of the creek.
Red Hook—Fort Defiance.—This work, already referred to, was originally a single water battery, mounting four eighteen-pounders, en barbette, to prevent the passage of ships east of Governor's Island, as well as to keep the enemy from landing at the southern extremity of the peninsula. Washington speaks of it in May as being "a small, but exceedingly strong" fort. Lieutenant Samuel Shaw, of Knox's artillery, who was stationed there most of the summer, states that it was named "Fort Defiance," and subsequently strengthened by additional works, which, from the Hessian map and the [Stiles draft], appear to have consisted of a second and larger redoubt connected with the first by an intrenchment or inclosed way.[45] On the 5th of July, Greene wrote to Washington that he regarded Red Hook as "a post of vast importance," and proposed stationing a considerable force there permanently, as in that case the commanding officer would be "more industrious to have every thing in readiness, and obstinate in defence" when the attack came; and on the 8th we find the order for "Col. Varnum's regiment to remove their encampment to Red Hook, and do the duty of that post."
Fort Stirling.—The first work laid out on Long Island, as we have seen, was Fort Stirling, which, in connection with batteries on the New York side, was designed to command the East River channel. Its exact site has been a point of dispute. Several writers and old inhabitants associate the name with the remains of a large fortification which stood at the corner of Henry and Pierrepont streets as late as 1836. It is clear, however, that this was a work erected by the British during the latter part of the Revolution. General Robertson, acting as Governor of New York in 1780, wrote to Lord Germaine, May 18th, that, among other works thrown up to make New York more secure against an attack by the Americans, "a large square fort is built at Brooklyn Heights."[46] The traveller Smyth, writing in the same year, says, "The town [New York] is entirely commanded by a considerable eminence in Long Island, directly opposite to it, named Brookland Heights, on which a strong regular fort with four bastions has lately been erected by the British troops." This exactly describes the work in question.[47] The corner of Henry and Pierrepont streets, moreover, being a thousand feet back from the river's edge, could not have been selected at that time as the site for a strictly water battery intended for effective resistance. The fort must be looked for nearer the edge of the bluff, and there we find it. Both the [Stiles] and the Hessian maps place it directly on the bank of the river—the latter, a little north of what was then known as the Bamper House, or at about the intersection of Clark and Columbia streets.[48]
The fort was a strong inclosed work, mounting eight guns. Ward's men broke ground for it about the 1st of March, and continued digging, as their major, Douglas, writes, through "cold, tedious weather," until other troops took their place.[49]
Greene's soldiers, whose experience around Boston had made them veterans, at least in the use of the spade, now went to work to throw up these lines. He reminded them early of the importance of the post, and the necessity of preparation and vigilance. "As the security of New York greatly dependeth on this pass," runs his order of May 5th, "while these works are constructing, the general hopes the troops will carefully forward the same as fast as possible;" and this he followed up with the caution that if any soldier left his work without liberty, he should do fatigue duty for a whole week. Orders from headquarters in New York at the same time directed General Greene to report "all extraordinaries" to the commander-in-chief; the officers at Red Hook and Governor's Island to do the same; and the officer commanding the riflemen on Long Island to "constantly report all extraordinaries to General Greene." Although no enemy had yet appeared, every regiment in the army was ordered to mount a picket every evening, to lie on their arms, and be ready to turn out at a moment's notice.