Howe's campaign was controversial because, although he captured the American capital of Philadelphia, he proceeded slowly and did not aid the concurrent campaign of John Burgoyne further north, which ended in disaster at Saratoga for the British, and brought France into the war. Howe resigned during the occupation of Philadelphia and was replaced by his second-in-command, General Sir Henry Clinton. Clinton evacuated the troops from Philadelphia back to New York City in 1778 in order to stiffen that city's defenses against a possible Franco-American attack. Washington harried the British army all the way across New Jersey, and forced a battle at Monmouth Court House that was one of the largest battles of the war.