With these data at our command, it becomes easy to comprehend General Howe's movements during the spring and summer. His first intention was to push across New Jersey with the great body of his army, and occupy Philadelphia; and since he had twice as many men as Washington, he might hope to do this in time to get back to the Hudson as soon as he was likely to be needed there. He began his march on the 12th of June, five days before Burgoyne's flotilla started southward on Lake Champlain. The enterprise did not seem hazardous, but Howe was completely foiled by Washington's superior strategy. Before the British commander had fairly begun to move, Washington, from various symptoms, divined his purpose, and coming down from his lair at Morristown, planted himself on the heights of Middlebrook, within ten miles of New Brunswick, close upon the flank of Howe's line of march. Such a position, occupied by 8,000 men under such a general, was something which Howe could not pass by without sacrificing his communications and thus incurring destruction. But the position was so strong that to try to storm it would be to invite defeat. It remained to be seen what could be done by manoeuvring. The British army of 18,000 men was concentrated at New Brunswick, with plenty of boats for crossing the Delaware river, when that obstacle should be reached. But the really insuperable obstacle was close at hand. A campaign of eighteen days ensued, consisting of wily marches and counter-marches, the result of which showed that Washington's advantage of position could not be wrested from him. Howe could neither get by him nor outwit him, and was too prudent to attack him; and accordingly, on the last day of June, he abandoned his first plan, and evacuated New Jersey, taking his whole army over to Staten Island. [Sidenote: Uncertainty as to Howe's next movements]