General Jean Victor Marie Moreau

[Kaleva]

At the beginning of the War of 1812, President Madison offered command of U.S. forces to this exiled French rival of Napoleon.

"Jean Victor Marie Moreau (14 February 1763 – 2 September 1813) was a French general who helped Napoleon Bonaparte to power, but later became a rival and was banished to the United States."

http://en.wikipedia.org/wiki/Jean_Victor_Marie_Moreau