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In page Peninsular War:

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The guerrilla style of fighting was the Spanish military's single most effective tactic. Most organized attempts by regular Spanish forces to take on the French ended in defeat. Once a battle was lost and the soldiers reverted to their guerrilla roles, they tied down large numbers of French troops over a wide area with a much lower expenditure of men, energy, and supplies[citation needed][2] and facilitated the conventional victories of Wellington and his Anglo-Portuguese army and the subsequent liberation of Portugal and Spain.[4] Mass resistance by the people of Spain inspired the war efforts of Austria, Russia and Prussia against Napoleon.[5]