Knox departed Washington's camp on November 17 and traveled to New York City for supplies, reaching Ticonderoga on December 5. He shared a cabin with a young British prisoner named John André at Fort George at the southern end of Lake George. André had been taken prisoner during the Siege of Fort St. Jean and was on his way south to a prison camp. The two were of a similar age and temperament, and found much common ground to talk about. The next time they met, however, Knox presided over the court martial which convicted and sentenced André to death for his role in Benedict Arnold's treason.