On the right shore of the river the Argentines mounted four batteries with 30 cannons, many of them bronze 8, 10, 12 and 20-pounders. These were served by a division of 160 gaucho soldiers. There were also 2,000 men in trenches under the command of Colonel Ramón Rodríguez (es), together with the brigantine "Republicano" (es) and two small gunboats, "Restaurador" and "Lagos", with the mission of guarding the chains across the river. Some sources increase the Argentine naval power to a third gunboat, the unarmed brigantine "Vigilante," whose artillery had been dismounted and transferred to one of the batteries, eight armed launches and at least five armed barges.