In February, 1813, the regiment was removed to St. Pedro de Sul, on the Vouga, and in April to Agueda, between Coimbro and Oporto. In the mean time arrangements were made for opening the compaign, and in May, the British cavalry of the left wing crossed the Douro, some at Oporto, some at Lamega and other places, and entered the mountainous district of the Tras-os-Montes; they were followed by several divisions of infantry, and by the pontoon train; the whole under Lieut.-General Sir Thomas Graham. The TWELFTH Light Dragoons formed a part of this force; they passed the Douro at Oporto, accompanied this portion of the army in its difficult march through mountainous regions held to be nearly impracticable even for small corps, and forded the Esla at the end of May. The French, finding their position turned, fell back without hazarding a battle, and a series of retrograde movements brought them behind the Ebro. The TWELFTH Light Dragoons followed close on the rear of the retiring enemy, and moving towards the sources of the Ebro, traversed those wild, but beautiful, mountain-regions, through which the Marquis of Wellington moved his numerous columns to turn the position occupied by the French, who fell back upon Vittoria. On the 18th of June, the TWELFTH Light Dragoons overtook a French division, with which they skirmished until a British column came up, when the enemy retired. The skilful and brilliant movements of the British commander had forced the enemy back in confusion from the banks of the Tormes to the confines of the Pyrenees, in three weeks; and this splendid success was followed by a great victory in the valley of _Vittoria_ on the 21st of June, in the gaining of which the TWELFTH Light Dragoons had the honor to take part. They formed part of the left column under Lieut.-General Sir Thomas Graham, and supported the attacks of the infantry and artillery on the right of the enemy's positions at Abechuco and Gamarra Major, and towards the close of the action they crossed the little river Zadora, turned the enemy's right, and cut off his retreat by the Bayonne road. The loss of the regiment was small, viz.:--Cornet Hammond and one man killed, and three men wounded: its gallant bearing throughout the action, and the zeal, spirit, and activity evinced by the officers and men, were, however, conspicuous, particularly in its movements in the evening of that eventful day.