However, remember that Cinco De Mayo commemorates the victory of a 4,500 Mexican poorly-armed militia over a 6,500 professional French army at The Battle Of Puebla in 1862.
The French victory of 1863 was short lived, however, after the U.S. provided aid to Mexico to oust the cheese-eaters, who were expelled permanmently in 1867.
I'm going to correct myself since this really wasn't a victory in the end. Mexico city was temporily captured, but the French ultimately did lose.