Despite the dissolution of the brigade as a Dutch unit, the war, and the role of the Dutch soldiers in it, was not finished. The 123rd regiment remained a preponderantly Dutch unit, even under the command of French officers. Chassé was put in charge of a French brigade. From December 1810 on, they were involved unsuccessfully in the hunt for the guerrilla-leader El Chaleco, though there was some severe fighting with the guerrillas. During 1811, the left-over troops of the 123rd regiment in Spain were placed 'a la suite', meaning they were surplus, and could be re-designated. They were incorporated into either the 1st, 3rd or 6th Bataillon Auxiliaire de l'Armee du Nord, which were used to form the 130th Regiment of the line, which continued to fight in Spain, being present at the Siege of Burgos in 1812, the fighting around Pamplona and in the Pyrenees in 1813, and the Battle of Bayonne in 1814. By then, there were preciously few Dutchmen left. As early as January 1812, only 800 Dutch infantrymen were left in Spain. Meanwhile, the other, newly formed battalions of the 123rd regiment, augmented with new Dutch conscripts, became part of the army with which Napoleon invaded Russia in June 1812. There were no Dutch Peninsular veterans amongst those battalions, however. Some battalions of the 123rd Regiment became part of the brigade Coutard in the division-Merle of II Corps, commanded by Marshal Oudinot. On 19 October 1812, it was part of the rear-guard that covered the retreat of the Corps across the Dvina river at the Second Battle of Polotsk and so distinguished itself that "Polotsk" is one of the battle honors on the standard of the regiment. At the Battle of Berezina it again formed part of the rear-guard that was sacrificed to cover the French retreat. At the beginning of the battle the regiment still had 100 men fit for duty; after the battle it no longer existed. "Berezina" is another of the modern French regiment's battle honors.