Arnold's plaque at West Point.. Photo retrieved from boardgamegeek.com.
After his victories, Benedict Arnold began to run in to trouble. It was suspected by many Patriots that he was becoming too close to the loyalists, and he was facing a court martial over allegations of fraud concerning his expenditure claims during the Quebec Campaign. In spite of these issues, he was given command of West Point in New York in 1780. However, he eventually conspired to turn over West Point to the British.
Major John Andre. Picture retrieved from sonofthesouth.net
Word of his betrayal reached George Washington after the chief spy, John Andre', was captured by American forces. Andre was hanged, but American forces failed to capture Benedict Arnold. He went on to lead troops against the Americans though, thankfully, without the success that he had enjoyed as an American general.