The enemy retired behind the Douro, and the allies followed to the banks of that river, where the FOURTEENTH were formed in brigade with the first German hussars, and took the out-posts at Tordesillas. In the middle of July, Marshal Marmont commenced offensive operations and passed the Douro at several points, when Lord Wellington united his centre and left behind the Guarena stream, and the FOURTEENTH and German hussars covered the retreat from Rueda. The right wing of the allied army and a brigade of cavalry were at Castrejon on the Trabancas, and to cover the retrograde of this force, the FOURTEENTH and German hussars moved, on the 17th of July, to Alaejos. On the 18th some sharp skirmishing occurred, and the troops at Castrejon fell back behind the Guarena; the FOURTEENTH retired from the plain near Alaejos under a heavy fire, and took post behind the Guarena at _Castrillos_. The French army advanced to the opposite side of the river, and General Clausel, sent a brigade of cavalry across under Brigadier-General Carier, supporting it with a column of infantry, and manifesting an intention to press the British left. Major-General Victor _Baron_ Alten led the FOURTEENTH and first German hussars against the French cavalry, and some sharp fighting occurred, during which General Carier was made prisoner. While the British and French horsemen were warmly engaged, the twenty-seventh and fortieth regiments, supported by a Portuguese brigade, came rushing down the hill and broke the French infantry with an impetuous bayonet charge; the FOURTEENTH and German hussars had, in the meantime, driven back the French cavalry, and the two regiments charged the broken infantry, and sabred some, and made others prisoners. The regiment had eighteen men and twenty horses killed; Captain Brotherton, Lieutenants John Gwynne, Francis Fowke, thirty-four rank and file, and eighteen horses wounded. The regiment was actively employed in the operations of the succeeding three days, and occasionally skirmished between the opposing armies. On the 22nd of July the memorable battle of _Salamanca_ was fought; the FOURTEENTH skirmished with the enemy's advanced posts at day-break, and afterwards took their station in the line. By several changes of position, the French Marshal endeavoured to turn the right of the allied army and gain the road to Ciudad Rodrigo; Lord Wellington detected a false movement in the opposing army, and instantly ordering his divisions forward, commenced the battle. The FOURTEENTH light dragoons participated with the third division in its attack upon, and complete discomfiture of, the enemy's left; two squadrons under Lieut.-Colonel Hervey reinforced Brigadier-General D'Urban's Portuguese brigade, which turned the enemy's flank, and the regiment shared in the glorious struggle by which the French army was overthrown and driven from the field with a severe loss.