Armstrong conferred with Major General Henry Dearborn, commander of the American "Army of the North", at Albany, New York during February. Both Dearborn and Chauncey agreed with Armstrong's plan at this point, but they subsequently had second thoughts. That month, Lieutenant General Sir George Prévost, the British Governor General of Canada, travelled up the frozen Saint Lawrence to visit Upper Canada. This visit was made necessary because Major General Roger Hale Sheaffe, who had succeeded Brock as Lieutenant Governor of Upper Canada, was ill and unable to perform his various duties. Prévost was accompanied only by a few small detachments of reinforcements, which participated in the Battle of Ogdensburg en route. Nevertheless, both Chauncey and Dearborn believed that Prévost's arrival indicated an imminent attack on Sackett's Harbor, and reported that Kingston now had a garrison of 6,000 or more British regulars.