The main body of the enemy's force, under Sir Henry Clinton, was in the city of New York and its immediate vicinity; Lord Cornwallis, with his own command and that which, under Generals Phillips and Arnold, had overrun some portions of Virginia, numbering in the aggregate about seven thousand three hundred fifty men, exclusive of seamen and Tories, was occupying the neck of land between the James and York rivers, where General Lafayette was holding him in check; while the Southern army, under Lieutenant-Colonel Balfour, through the successful movements of General Greene, was mostly confined to Charleston and its immediate vicinity. Admiral Rodney, with a large naval force, was leisurely spending his time in securing his portion of the spoils in the West Indies; Sir Samuel Hood, with fifteen sail of the line and six smaller vessels, had been detached by Admiral Rodney to intercept Admiral de Grasse, and to maintain an equality of power in the American waters; and Admiral Graves, with part of his fleet in New York and a part before Newport, caused the enemy to feel perfectly secure in the positions he occupied. As has been stated, the intelligence from Admiral de Grasse changed the plans of the allies; and, instead of General Clinton and the main body of the enemy in the city of New York, Lord Cornwallis and the combined forces under his command, then at Yorktown, were made the objects of General Washington's attention. In executing this plan, however, it was necessary to exercise great caution, not only to prevent Sir Henry Clinton from moving to the assistance of Lord Cornwallis, but also to prevent Admiral Graves from joining Sir Samuel Hood, and, by occupying the Chesapeake, keeping open the communication by sea between Yorktown and New York. For this purpose, on August 19th the New Jersey line and Colonel Hazen's regiment were sent to New Jersey, by way of Dobbs Ferry, to protect a large number of "ovens" which were ordered to be erected near Springfield and Chatham in that State; and forage and boats, with some efforts to display the same, were also collected on the west side of the Hudson, by which the enemy was led to suppose that an attack was intended from that quarter. Fictitious letters were also written and put in the way of the enemy, by which the deception was confirmed; and Sir Henry Clinton appears to have supposed that Staten Island, or a position near Sandy Hook, to cover the entrance of the French fleet into the harbor, was the real object of the movements, until the allied forces--which had crossed the Hudson, leaving General Heath, with a respectable force, on its eastern bank--had passed the Delaware, and rendered the true object of the movement a matter of obvious certainty.