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