Ok, so I only had one French guy to fight a bunch of English and Portuguese.
Just imagine the British/Portuguese forces are retreating, and the French cavalry are in hot pursuit. :)
I don't know if you've ever read a G. A. Henty novel before and though on average the plot of his stories may be a bit simple and straightforward, his vivid descriptions of the campaigns and battles in his various books are truly exceptional.
I would certainly recommend you check him out. Most of his books can be found on Project Gutenberg.