sentences:  "Impero" was intended to be equipped with an anti-aircraft battery that comprised twelve 50-caliber Model 1938 guns in single mounts, twenty 54-caliber guns in eight twin and four single mounts, and sixteen 65-caliber guns in eight twin mounts.The ship was protected by a main armored belt that was with a second layer of steel that was thick.The main deck was thick in the central area of the ship and reduced to in less critical areas.