An American Spy (for the British) in the War of 1812-- Part 1

From the September 27, 2021,  Press-Republican " 'In plain sight':  New museum exhibit reveals American spy in War of 1812" by Fernando Alba.

Keith Herkalo, president of the War of 1812 Museum in Plattsburgh, New York, was looking over some documents  from the University of Michigan when he saw something of great interest.  It was from an American merchant to a British merchant in Montreal after the Battle of Plattsburgh in 1814.

The merchant wanted to move his goods north into the St. Lawrence River and then on to Halifax in Canada.  The letter was sent just three months after a British invasion had been turned  back at the Battle of Plattsburgh.

Only, that letter was treason since the U.S. had an embargo on.  The merchant was in New York City and wanted to "go around" the embargo and make some money.

But, he would need  support from someone in the British government for safe passage.

So. Who Was This War of 1812 American Spy and What Info Did he Give the British?  --Brock-Perry