On 27 May 1793 Servan sent a force under Pierre François Lambert Lamoureux de Genettière to threaten the Roncevaux Pass. Caro sent a column under Pedro Caro, 3rd Marquis of la Romana to counter the French. On 6 June the two sides clashed at Chateau-Pignon. At first Moncey with Jean Boudet, the 5th Light Infantry and few other units did well but superior Spanish forces soon forced them back on the main body. After a few rounds of artillery fire, the untried French volunteers fled leaving Genettière to be captured. La Romana's soldiers then successfully stormed Chateau-Pignon. On 22 June Servan pushed the Spanish left wing back to the Bidasoa, capturing the Montaigne Louis XIV redoubt. On 30 August, Deprez-Crassier ordered a major assault on the Spanish outpost of Biriatou. La Romana not only repelled the assault but drove the attackers back to the Sans Culottes Camp near Urrugne. On the same day, José Urrutia y de las Casas repulsed a second column under Willot in its attack on Bera (Vera).