Well as the Guerrilla rule in many interesting and good scenarios to balance the lower quality of the Spaniards in front of the French, I do not think it has a real historical link with the individual battles fought in Spain.
The phenomenon of Guerrilla Spanish was very important, but it had no effect on the level strategic lines of communication and couriers always threatened danger forced the French commanders to deploy many units to guard their rear.
But in the battle field, what is the use of Guerrilla?