When the Second Continental Congress authorized an invasion of Quebec, in part on the urging of Arnold, he was passed over for command of the expedition. Arnold then went to Cambridge, Massachusetts, and suggested to George Washington a second expedition to attack Quebec City via a wilderness route through present-day Maine. This expedition, for which Arnold received a colonel's commission in the Continental Army, left Cambridge in September 1775 with 1,100 men. After a difficult passage in which 300 men turned back and another 200 died en route, Arnold arrived before Quebec City in November. Joined by Richard Montgomery's small army, he took part in the assault on Quebec City on 31 December, in which Montgomery was killed and Arnold's leg was shattered. Rev. Samuel Spring, his chaplain, carried him to the makeshift hospital at the Hotel Dieu. Arnold, who was promoted to brigadier general for his role in reaching Quebec, maintained an ineffectual siege of the city until he was replaced by Major General David Wooster in April 1776. 