[size=3]The Direction of Cruiser Construction and its integration into the “New Navy”[/size]
[size=1]By Jacques Sapir and Conte di Rosso[/size]
Cruiser construction is pro-eminent in thinking leading to Fleet rebuilding post-war. Initially cruisers were supposed to play four distinct war roles entailing different specifications:
Strategic scouting (long range, good communication)
Tactical scouting (good armament and protection to fight for information)
Fleet screening (high speed to be combined with DD, good torpedo armament)
SLOC off/def (long range, good armament to dispose off any AMC or trade cruiser).
Peace employment includes training and enforcing political presence.
These different missions traditionally are split into three different cruiser types, the Fast ACR (Pisa, San Marco), armed with 10" guns and with good protection for tactical scouting, the large trade cruiser for SLOC off/def and strategic scouting (which plays little part in Italian thinking), and the small fleet cruiser (Quarto Esploratori types) for fleet screening. Such thinking was explicit during first talks held in winter 1924/25 and have lead to the June 1928 conference about fleet rebuilding. Even if no new major ship construction is seen possible before 1933 for economic reasons, a long-range plan has to be drafted. Capitalizing on the brief clash between Denmark and India, both the fast ACR and the fleet cruisers are seen as vindicated. The trade cruiser is something of a novelty, but plays more on Italian minds as we become closer to Iberia and her overseas territories. However, other naval powers are building large cruisers armed with 8" or 210mm guns (the so-called Cleito-type) and it made sense to assume that any new large cruiser had to be able to fight "treaty" cruisers.
In 1928 thinking has evolved fast. First studies done at the Naval War College demonstrated that iterations of the "treaty" type are weak on armour. The fast ACR could be then a very potent cruiser-killer. At this point carrier-based aviation was becoming a relevant factor both for tactical scouting (hence relieving the need for an ACR or scout cruiser) and for strike, with the development of torpedo-carrying planes. It has to be noted that the Italian Air Attaché in Germany had sent by spring 1927 a complete report about dive-bombing trials done in Germany and Soviet Union. The potential of Dive-Bombers has begun to be appreciated in the Navy by 1928 when a study demonstrated that a 250kg bomb launched at 1500m would be equivalent to a 10" shell. The newly tested two-seat scout aircraft designed by the Fiat company could be turned into a provisional dive-bomber. Quick progresses in aircraft engine design are promising powers between 800hp to 1000hp for mid-30's. Already, there exist existed 2 1000hp engines of Fiat and Isotta-Fraschini design, but development is proving troublesome. Planes able to carry a 500kg AP bomb (equivalent to a 12" shell) or even a 750kg one (equivalent to a 14" shell) could well be at hand by the mid -30s. Combined to torpedo-delivering planes, which are the our much favoured type, it appears that Carrier-based air groups could deliver a considerable punch, or at least a useful hinderance, when ships of the "New Navy" would be completed.
Now it is important to recall what is the main strategic assumption of Italian military authorities. We assume that the country would not face the full strength of a possible enemy (seen by 1928/27 as either the USA, Atlantis, SAE or SATSUMA) because such enemy would have to husband a large part of his naval forces against another major naval powers. Hence a limited fleet could be quite enough to have a deterrence effect, the more so because countries supposed to be possible enemies did not have major naval bases close to Italy apart from France. Hits on capital ships, even if not lethal would imply retreat to well equipped base and would let the enemy at a diminished strength to face his possible other competitors.
Actually, the Minister for Defence and Military Affairs Paulo Yue stated at a Defense Council meeting in March 1927:
"If you can cut your enemy's arm and let him face his other adversaries with just one hand you will make him think twice before attacking a country he can't see as a major military threat for him. Building up our forces to achieve a complete kill against any major world power would then be a waste of resources badly needed in other places. What our country needs is a combination of forces making the prospect of any intervention against us as a protracted and risky business implying such losses, both military and political at home, that the interventionist would be considerably weakened when confronting his opponents in the struggle for world supremacy. In the context of the current world's correlation of forces between major powers this would give a weaker military power like us an effective lever against stronger powers."
Another growing influence on our thinking has been the need to operate in 3 distinct areas; the Meditterenean first and foremost; the Red Sea and Indian Ocean; and the Atlantic and Carribean in support of our erstwhile ally. Even so, the firming up of relations between Italy and the Netherlands has raised yet another possibility, that of operations in the East Indies.
Operations in the Meditterenean are seen to be berefit of BBs. They are seen as too valuable to risk in an environment rich in small craft. However the aircraft carrier-cruiser group gives visibility yet limited expendability, which is seen as essential. The situation in the Indian Ocean is different. With vast ocean to search, encounters are expected to be rare, again lending support to the Carrier-cruiser group to bring an enemy to battle. Warfare in the Carribean and Atlantic is seen to be an extension of the Meditterenean, with sporadic clashes and confused battles. The shorter ranges and larger draughts of our battleships ensure that they will be impossible to use in the Carribean and most probably restricted to operations in the Bay of Biscay and around the Azores. The fast ACR has a perfect environment here in which it can sucessfully both interdict traffic and hunt on the high seas.
A new mission is appearing for the cruiser force, which is Carrier-escort at night and in bad weather against cruisers and destroyers during the opening phases of operations. In bad weather or at night, CVs could encounter enemy cruisers; hence a potent cruiser was needed. Experience in naval exercises with KDM Jutland have shown this vulnerability. But carriers are also to expect air attack and be able to destroy enemy scouting aircraft, hence a good AA platform is a requirement for any CV-escort. The demise of tactical scouting does not translate into the demise of the large cruiser, which can become a specialised CV escort coupled with a trade protector/raider whilst the CV takes on the role of scouting.
With the newly-elected government in 1928, finances have become a important factor too. Some doubts were raised on the cost estimates of a full program with 5 BBs, backed by Zara-type cruisers and 2 aircraft carriers. The cost of this program is roughly £120m. When coupled with the need to improve infrastructure in the EAS, this is unaffordable.
The BB project is already clearly in trouble, despite 1 ship being laid down, as aviators are proclaiming their ability to deliver heavy bombs and torpedoes quite accurately. Politically too the BB project is becoming highly sensitive as there is much muttering in foreign countries over our interests. Internally, there are some factions who would like to make far-reaching liberal reforms than construct vessels of limited purpose. The lack of activity of the Italian battleships in the war has questioned the rational behind their existance. Their only real affect was in shore bombardment; the projection of sea power onto land. This is something naval aircraft are able to do for less cost.
A heavy cruiser force is seen as politically less damaging as a true cruiser race has already developed between Cleito-treaty powers. But, if political angles were to be accepted, then the fast and well armoured battlecruiser was problematical too. Now, in 1928 this project has evolved into a large ship which could grow still. A conference held in June 1928 at the Naval War College reached the following conclusions:
:-BB construction has to be abandoned altogether, as BBs are too expensive and too limited a design.
:-A large CV force (4 new, purpose-built carriers) is desirable and has to be escorted by large cruisers, and fleet cruiser began to mean now a CV-escort type.
:-The Zara type cruiser should be a excellent vessel but is too limited with regard to the 5 roles imposed on it. A reduced version of the A2 design which at the moment is a small battlecruiser with VIII x 10" (4xII), VIII x 130mm, and XII x 100/47 AA, could be scaled down and used for an 8in cruiser.
I propose the curtailing of future battleship construction until such a time when economic conditions allow for a large naval construction program to be instigated. The current fleet of battleships should be sold by 1933 with the exception of the Caracciolo-Class and Lepanto. The older ships are too limited, too small and too slow. The 2 aircraft carriers currently under construction will be completed along with 2 of new construction. A detailed study into the A2 design should be produced for the production of at least 12 vessels by 1933. Initial estimates for this program are of around £50-60m, a significant saving over the battleship program.