Mendoza, an officer of the Spanish Navy, sadly contemplates the "Cervera" cruise, scrapped after serving glorious services for many years. He remembers with nostalgia the history of the ship, so close to him. There he met Mary, his girlfriend, and when they both believed themselves to be the happiest beings in the world, the outbreak of the Spanish Civil War severed them abruptly. Mary went to take refuge with her family to the besieged barracks of Simancas, to which "El Cervera" was ordered to bomb when the enemy took it by assault. Mendoza did not know anything about his girlfriend again. Antonio, his older brother, was assigned to the "bous" and the youngest, Manuel, served as an officer on the "Baleares" cruise. Through the story of each one we will know the main actions of the battle for the dominion of the sea.—jsanchez