When the French army under Marshal Soult advanced to resume offensive operations, the allied army retired to a position in the _Pyrenees_ in front of Pampeluna, where some severe fighting took place, and the repeated attacks of the French were repulsed. Speaking of the action on the 28th of July, Lord Wellington stated--"In the course of this contest, the fourth division, which has so frequently been distinguished in this army, surpassed its former good conduct." On the 30th of July the FIFTY-THIRD regiment had an opportunity of distinguishing itself, during the severely contested action in the mountains; and the light infantry, commanded by Captain FEHRSZEN, of the FIFTY-THIRD, signalized themselves in a particular manner. The meritorious conduct of Captain FEHRSZEN was rewarded with the rank of major. The French were driven from their post, and pursued to their own frontiers: and the word "PYRENEES" on the colours of the regiment commemorates the heroic conduct of the officers and soldiers of the second battalion on this occasion. Their loss was three men killed and twenty-one wounded. The following officers served at the battle of the Pyrenees:-- _Lieut.-Colonel_ G. R. BINGHAM. _Captains_ O. G. Fehrszen and James Mackay. _Lieutenants_ C. F. Hunter, Thomas Impett, James Hamilton, and Thos. Dowker. _Ensigns_ George Fitzgerald, Michael Nagle, and John Wilton. _Pay-Master_ J. MacLean. _Adjutant_ John Carss. _Quarter-Master_ R. Blackie. _Surgeon_ T. Sandall. _Assistant-Surgeon_ C. MacLean. Pursuing the French army through the mountains, the FIFTY-THIRD captured some prisoners and baggage, and arrived at Puerto de Echalar on the 2nd of August, when Major-General Barnes's brigade was engaged with two French divisions, which it drove from the heights. Five days afterwards the FIFTY-THIRD were removed to the vicinity of Lezaca, where the head-quarters of the allied army were established; from this place a few volunteers of the FIFTY-THIRD proceeded to _St. Sebastian_, and were engaged in storming that fortress on the 31st of August, when two men of the regiment were killed and two wounded. On the same day the French crossed the Bidassoa in considerable force, and attacked the Spanish troops on the heights of San Marcial. On this occasion the FIFTY-THIRD were engaged in extended order in the pass of _St. Antonio_, where they had one man killed and twenty wounded. The French were repulsed, and giving up all hope of being able to relieve St. Sebastian, they re-crossed the river. At the passage of the _Bidassoa_ on the 7th of October, the FIFTY-THIRD supported the light division; and during the action on the following day they were in reserve.