 The royalist squadron was composed of the brigantines "Belén" (220 tons), "Nuestra Señora de Aránzazu" (181 tons), and "Gálvez" (90 tons), sloops "Americana" (60 tons) and "Murciana" (115 tons), gunboats "Perla", "Lima", and "San Ramón" (30 tons), plus four small support vessels.Even though the number of vessels was in parity, the total of guns favored the rebel navy.With 91 cannons, 430 sailors and 234 troops in front of the 36 cannons (2 in a land battery) and 442 men of the royalists, the advantage was supposedly on the revolutionary side.