On the 5th of May, 1811, Lacy took an active part in the battle of Chiclana, which was fought on the eastern bank of the channel of San Pedro, and immediately opposite the Isle de Leon. The brave defence at Cadiz greatly encouraged the Spaniards elsewhere. In June he was appointed Commandant-General of Catalonia; but, unfortunately, was unable to prevent the ancient seaport of Tarragona from falling into the hands of the French. Indefatigable and unwearying, he rallied the remains of the Spanish forces, and, with the Guerillas, organized a new army, at the head of which, for a year and eight months, he maintained a constant, an obstinate, and unequal struggle with the troops of Napoleon. His glorious courage and undying perseverance gained for him, in 1812, the chief command of the army in Gallicia, about 10,000 strong. This force joined Lord Wellington; but, after active operations ceased, marched back into the province from which it was named, and went into winter-quarters. On the new campaign being opened, he appeared at the head of the brave _Gallegos_, and continued to display the highest military talent against the enemy, until they were driven over the Pyrenees by the British; after which, the battles of Orthes and Toulouse, and the capture of Paris by the allies, by securing the peace of 1814, restored tranquillity to ravaged Europe, and Ferdinand VII. to the throne of Spain. Strange to say, this event, for which he had struggled so hard, was unfortunate for Lacy, who, in consequence of his known attachment to the constitution of the Cortes, was deprived of all his offices--a base return for his many noble services--and he was coldly permitted to retire in obscurity, with his family, to Vinaroz, in the province of Valencia, where he spent two years in peace, though brooding over his wrongs, and planning means of redress. In 1816, fatally for himself, he returned to active life; for, since the death of Parlier, and other brave men, who had fallen in attempting to secure to Spain that independence for which they had struggled against France, the eyes of all the Liberalists were turned on Louis Lacy, and in him their hopes reposed. Having gone to Calvetes, in Catalonia, to drink the mineral waters, it chanced that he met there an old companion in arms, General Milano, and his brother, Don Raphael Milano, with two other Spanish gentlemen, whose political sentiments coincided with his own; and, after several secret meetings, they boldly resolved on re-establishing the Cortes at the point of the sword; for Lacy, relying on the sympathy of several regiments, and the regard they paid to his name and achievements, hoped to make them revolt in his favour, on the 5th April, 1817, and proclaim the Constitution. Denounced by two traitors, the whole enterprise fell to pieces, and the four projectors failed to save themselves.