He engaged in constant battles and skirmishes that took place until the fall of the city of Valencia to the French, but a combination of fortuitous invents were to follow.

The regiment of Ferraz was deployed the fields of La Mancha (south of Madrid) where he distinguished himself in the fighting that preceded the ultimate French expulsion and the signing of the eventual peace treaty.

After the war he held the military field rank of Captain (Teniente in Spanish), and requested a posting to South America where the royal armies faced the Peruvian separatists.

There they collected the horses and supplies needed for the campaign, and proceeded to the front-line of the war zone to join the royal army of Upper Peru in its barracks Santiago de Cotagaita, on the basis of the European troops would, in 1817 form a squad of Grenadier Guards of 78 men commanded by Ferraz.

The outstanding performance of Ferraz troops converted their mission from one of escort detail to a front-line regiment which came to have four squadrons with two beater and two shooter companies totalling some 600 men.

Valentín returned to Spain in 1825, and boosted his career under the tutelage of General Baldomero Espartero, rising through the ranks to the highest institutions, but always faithful to his liberal ideas.