With this force, Moncey won the Battle of the Baztan Valley and followed up his success by capturing Pasaia, San Sebastián and Tolosa.

Promoted to command the army for his great success, Moncey planned to lay siege to the Spanish fortress of Pamplona.

His commanders were Generals Manuel Cagigal, Antonio Filangieri, Frias, and Marquis de la Canada Ibagniez.

[1][note 2] Moncey launched his offensive from the Baztan valley, and from the area of Roncevaux Pass to the south toward Pamplona.

[6] On 15 October, Delaborde's division attacked Filangieri at Mezkiritz (Mezquiriz), 8 kilometres (5.0 mi) southwest of Roncesvalles.

[1] The French inflicted damage on the Spanish army and gained ground closer to the Pamplona fortress.

When the news of peace reached the front in August, Moncey's advance was across the Ebro, while other forces prepared to invest Pamplona.