While Wellington concentrated his efforts on capturing the strategically important port of San Sebastián, he sent 11,000 men under the Irish-Spanish General O'Donnell to blockade Pamplona. To prevent a French counter-attack over the Pyrenees Wellington positioned General Hill's Corps over a 50 miles (80 km) front, to cover the coastal road and the main passes over the mountains.
Having rapidly rebuilt and reorganised his forces after their defeat, the French under Marshal Soult launched an attack towards Pamplona through the passes of Maya and Roncesvalles.
The French force at Roncesvalles consisted of 40,000 men and 8 mountain guns under Generals Reille and Clausel. The pass was defended by the British 4th Division commanded by Major-General Galbraith Lowry Cole and was helped by the Portuguese 4/10 brigade.
The French attacked from Saint-Jean-Pied-de-Port advancing in two columns either side of the pass. Clausel on the Altobiscar and Reille on the Linduz. At around 06:00 the two armies met. The British were badly outnumbered, Byng's brigade on the eastern side held Clausel's division at bay for three hours before being forced back.
By 14:00 Cole brought up three more brigades as reinforcements. However around 17:00 a dense fog descended over the battlefield, just as the Portuguese 4/10 brigade repelled French attacks in the Val de Baigorry. Cole, despite orders to the contrary, ordered his troops to retreat towards Pamplona.
The Allied forces regrouped and made a stand near the village of Sorauren at the Battle of Sorauren. Later Wellington admitted that splitting his forces in order to besiege both San Sebastián and Pamplona simultaneously was "one of the greatest faults he ever committed in war".
Colonel Walter O'Hara, who fought in the battle, would name Roncesvalles Avenue in Toronto after the battle. The neighbourhood of Roncesvalles in turn gained its name from the street.
- Chandler, David, Dictionary of the Napoleonic Wars, Wordsworth Editions, 1999. ISBN 1-84022-203-4
- Longford, Elizabeth, Wellington: The Years of the Sword, Panther Books Ltd., 1971. ISBN 586 03548 6
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