If you can read Spanish there is an excellent (and long) article about this exact subject here, there is a wonderful shot of a squadron of Curassiers mounted the wrong way round! You can see it below if you don't want to download the article, the officer is calling his men a bunch of cowards and threatening them with being sent to Russia for the winter! The article originates from the magazine Researching&Dragona, nº6
The first set of pictures here are from a post on the GUERRA DE LA INDEPENDENCIA 1808-1814 blog, the second set of 4 are from the 'Asterix' era and came from this blog which is dedicated to Spanish 'classic' comics in general. The bottom picture is from a pamphlet for a 2008 exhibition the original can be found here. The artwork on the Talavera piece was by Dionisio Álvarez Cueto who some of you will be familiar with, if not you can look here.
All these are sadly just a single pictures rather than the actual comics, but here is a link to one comic that you can download or read online, this one is about Dos de Mayo and Goya, more an educational piece than a 'Sharpe' style adventure.
In the Asterix style
Or next winter you will be in Russia!
Historietas sobre la Guerra de Independencia