The Spaniards arrived at Callao, on April 25, with 7 warships and 7 auxiliary ships carrying 252 guns, most of them (126 pieces) 68-pounder cannons. The Spanish ships included the ironclad "Numancia" and the steam frigates "Reina Blanca", "Resolución", "Berenguela", "Villa de Madrid", "Almansa" and the corvette "Vencedora". A V-Shaped formation characterized the Spanish fleet, with the smaller ships on the back. This was one of the most formidable fleets that had assembled up to that point in the waters of the American Pacific Ocean.