Actually he was never much of a guerilla.
Oh no?
“The following year he led another expedition to the area to assist in the construction of a fort at present-day Pittsburgh, Pennsylvania. Before reaching that point, he and some of his men, accompanied by Indian allies, ambushed a French scouting party. Its leader was killed, although the exact circumstances of his death were disputed. This peacetime act of aggression is seen as one of the first military steps leading to the global Seven Years’ War.”
http://en.wikipedia.org/wiki/George_Washington_in_the_French_and_Indian_War