The Italian Navy

At the date of May 24, 1915, Italian Navy included: 5 dreadnoughts, 8 pre-dreadnoughts, 8 armored cruisers, 6 scouts, 35 destroyers, 61 torpediniere, 18 submarines plus other units. The main fleet bases were Taranto and Brindisi which blocked access to Adriatic Sea. Venice was too dangerous to operate more than light units and La Spezia (on Tyrrenean Sea) too distant. Tasks of Italian navy included to front Austrian Navy and protect Mediterrean routes by submarines. Substantially operations never exited from Adriatic Sea where was fought a sort of continuos naval guerrilia between respective light forces, including mine warfare, submarine activity, etc.. Naval aviation played an important role. Italians developed also a new kind of very little fast torpedo boat called MAS, very useful in the close spaces of Adriatic. It was a MAS (exactly MAS 15) which had the best Italian success of war, sinking the Sankt Iztvan battleship the night of June 10, 1918.
To support land fronts, Italian Navy built a large number of armed pontoons which were employed as heavy artillery (some mounted 381mm guns). After Caporetto retreat, it was formed a land unit made of sailors to protect Venice; called Navy Brigade, it was employed until the end of war, after that, it became the San Marco Marine Regiment. Last, in WWI Navy experimented new methods to attack enemy in harbors, methods which reached their best in WWII.