Despite the French defeat, Uruguay was still an open war theater. Manuel Oribe claimed to be the rightful president of Uruguay, and waged the Uruguayan Civil War against Rivera. Rosas supported Oribe in the conflict, as Uruguay was still at war with Argentina. Oribe laid siege to Montevideo. Britain and France joined forces with Rivera, captured the Argentine navy, and began a new naval blockade against Buenos Aires. Giuseppe Garibaldi helped to secure the Uruguay river, aided by Italian soldiers. A new expedition tried to secure the Paraná river by navigating to Paraguay and returning. The Argentine army resisted the invasion of the river at several points along the Paraná (most notably during the battle of Vuelta de Obligado), but could not stop them. The damage to the British and French ships, however, were so great that both countries eventually resigned and lifted the blockade.