Under this plan, the line of the East River required the principal attention, as here it seemed possible to offer the best resistance to British attempts upon the city. First, to cut off the enemy's communication between the Sound and the river, it was proposed to blockade the passage at Hell Gate by a fort on Horn's Hook, at the foot of East Eighty-eighth Street, as well as by works opposite, on the present Hallet's Point. A further object of these forts was to secure safe transit between Long Island and New York. In the next place, batteries were planned for both sides of the river at its entrance into the harbor, where the city was chiefly exposed. On the New York side, a battery was located at the foot of Catherine Street at the intersection of Cherry, and where the river was narrowest. This was called Waterbury's Battery. To cover its fire a stronger work was ordered to be built on Rutgers' "first hill," just above, which was named Badlam's Redoubt, after Captain Badlam, then acting as Lee's chief artillery officer. Lower down a battery was sunk in a cellar on Ten Eyck's wharf, Coenties Slip, a short distance below Wall Street, and called Coenties Battery. These three, with part of the Grand Battery and Fort George, included all the works planned by Lee to guard the East River from the New York side. In connection with these, works were laid out on the bank opposite on Long Island, the importance of which was apparent. Not only was the site well adapted for guns to sweep the channel and prevent the enemy's ships from remaining in the river long enough to do the city serious damage, but it also commanded the city, so as to make it untenable by the British should they succeed in occupying it. This bluff, "Columbia Heights," was in fact the key to the entire situation. Lee considered its possession and security of "greater importance" than New York; and to hold it he proposed establishing there an intrenched camp[22] for three or four thousand men, fortified by "a chain of redoubts mutually supporting each other." Of these redoubts, one was located on the edge of the bluff opposite the Coenties Battery, and stood on the line of Columbia Street, at about the foot of the present Clark Street. This came to be known as Fort Stirling. In its rear, near the corner of Henry and Pierrepont streets, it was proposed to erect a large citadel; but this, although begun, was never completed.[23] Lee's scheme of defence did not include the fortifying of either Red Hook or Governor's Island. [Footnote 22: Lee wrote to Washington, February 19th: "I wait for some more force to prepare a post or retrenched encampment on Long Island, opposite to the city, for 3000 men. This is, I think, a capital object; for, should the enemy take possession of New York, when Long Island is in our hands, they will find it almost impossible to subsist."]