Battle of La albuera
The Battle of Albuera (16 May 1811) was a battle during the Peninsular War. A mixed British, Spanish and Portuguese corps engaged elements of the French Armée du Midi (Army of the South) at the small Spanish village of Albuera, about 20 kilometres (12 mi) south of the frontier fortress-town of Badajoz, Spain. (read more here https://en.wikipedia.org/wiki/Battle_of_Albuera
What looks great to me about a map based on this battle? Is a large terrain with a low river crossing it, there was a fight on the stone bridge that cross the river near the village of La Albuera. This map bring us enough terrain to have a fun event with cobants in the open fields, the streets of the village or the bridge or the hills as historically happened. This map is for realistic gameplay modes
So the map can be as longs as the developers think it need, it can be just the representation of the village and the bridge, wich will be a medium size map, or it can also include all the open fields and hills as a large or very large map.
British come from the West, the side of the riber were the village is, and the French come from the East. There is more impormation about this battle around the internet in case someone needs more explanation
This is a good top view of the terrain and the distribution of the order of battleThis is the google maps location
And finally, some cool images from a great diorama:The full gallery of 39 imgs
Edit: Found more detailed information about the battlehttp://balagan.info/battle-of-albuera-16-may-1811