The narrative offers a detailed chronological account of naval warfare and anti-pirate operations in the mid-16th century Mediterranean, tracing papal naval administration, alliances, and campaigns under successive captains including Gentil Virginio Orsini, Carlo Sforza, and Flaminio Orsini. It documents fleet musters, ship inventories, sieges and battles such as operations around Prevesa and Algiers, interactions with corsairs like Barbarossa and Dragut, political negotiations among Christian states, logistical challenges of crews and galleys, and episodes of mutiny, capture, and recovery, concluding with evaluations of commanders, outcomes, and an alphabetical index of persons and places.