It was the object of Howe to deceive Washington, if possible, and hence he sent a large part of his army on board the fleet at New York, under the command of Cornwallis, as if Boston were his destination. He intended, however, to capture Philadelphia, the seat of the "rebel Congress," with his main force, while other troops were to co-operate with Burgoyne. Washington, divining the intentions of Howe, with his ragged army crossed the Delaware once more, at the end of July, this time to protect Philadelphia, leaving Arnold and Schuyler to watch Burgoyne, and Putnam to defend the Hudson. When, late in August, Howe landed his forces below Philadelphia, Washington made up his mind to risk a battle, and chose a good position on the heights near the Brandywine; but in the engagement of September 11 was defeated, through the negligence of Sullivan to guard the fords above against the overwhelming forces of Cornwallis, who was in immediate command. Still, he rallied his army with the view of fighting again. The battle of Germantown, October 4, resulted in American defeat and the occupation by the British of Philadelphia,--a place desirable only for comfortable winter quarters. When Franklin heard of it he coolly remarked that the British had not taken Philadelphia, but Philadelphia had taken them, since seventeen thousand veterans were here kept out of the field, when they were needed most on the banks of the Hudson, to join Burgoyne, now on his way to Lake Champlain. This diversion of the main army of Howe to occupy Philadelphia was the great British blunder of the war. It enabled the Vermont and New Hampshire militia to throw obstacles in the march of Burgoyne, who became entangled in the forests of northern New York, with his flank and rear exposed to the sharpshooters of the enemy, fully alive to the dangers which menaced them. Sluggish as they were, and averse to enlistment, the New England troops always rallied when pressing necessity stared them in the face, and fought with tenacious courage. Although Burgoyne had taken Ticonderoga, on Lake Champlain, as was to be expected, he was, after a most trying campaign, at last surrounded at Saratoga, and on October 17 was compelled to surrender to the militia he despised. It was not the generalship of the American commander which led to this crushing disaster, but the obstacles of nature, utilized by the hardy American volunteers. Gates, who had superseded Schuyler in the command of the Northern department, claimed the chief merit of the capture of the British army, nearly ten thousand strong; but this claim is now generally disputed, and the success of the campaign is ascribed to Arnold, while that of the final fighting and success is given to Arnold together with Morgan and his Virginia riflemen, whom Washington had sent from his own small force.