In the Battles of San Millán and Osma two divisions of the Allied army of Arthur Wellesley, Marquess of Wellington clashed with two divisions of King Joseph Bonaparte's Imperial French army in northeast Spain. "extremely punishing couple of miniature battles at Osma and San Millan which ruined Maucune's division and sent the Army of ... There were in fact two armies involved in the campaign of 1813 " "Contact was, however, inevitable and on 18 June there was a sharp fight at the small village of San Millan, when the Light ... The French tried to make a stand at Osma the same day, but this was effortlessly beaten back and with it went .."

The Battle of Maya saw an Imperial French corps led by Jean-Baptiste Drouet, Comte d'Erlon attack the British 2nd Division under William Stewart at the Maya Pass in the western Pyrenees. Despite being surprised, the outnumbered British soldiers fought stoutly, inflicting greater losses on the French than they suffered themselves. By the afternoon, the French gained the upper hand and were pressing forward, but the late arrival of a brigade from the British 7th Division stabilized the situation. The British forces slipped away under the cover of night and the French did not pursue effectively. The Peninsular War battle at Maya was part of the Battle of the Pyrenees, which ended in a significant Anglo-Allied victory.