I've been delayed getting back to this one, but some interesting passages from consulting Moretz. Quotes are in blue
p. 164 War with the United States
"The Service examined at the War College he general lines of how such a war might waged, held exercise on war game table and conducted, at sea, exercise in which Red Fleet, the British force, opposed Blue fleet, the United States Navy. An example of this was the exercises conducted by the Atlantic Fleet during its passage from England to Spanish waters during the Spring cruise of 1921. Hood and Repulse, acting as US battle cruisers, in company with Tiger, representing the US battlefleet, were to intercept the Atlantic Fleet and force and action prior to the latter's arrival at Arosa Bay. As the United States Navy did not possess a single battle cruiser in 1921, ad had only recently begun construction of the type with the laying down of the Lexington-class, it may be concluded that purpose of the exercise was to gauge the material readiness of the Royal Navy in a not-too-distant future war."
p. 166 War with Japan
"Exercise E.A. conducted 17-20 January 1922 as the Atlantic Fleet sailed from Portland to Arosa Bay, tested the concept of escorting a convoy including a Mobile Naval Base supply ship. The convoy formed, in part, by the carrier Courageous, HMS Pandora, HMS Assistance and HMS Sandhurst, was escorted by Red Fleet, a force composed of seven battleships the First Light Cruiser Squadron, and two flotillas of destroyers in the face of the Blue Fleet, a squadron of two battle cruisers, the Second Light Cruiser Squadron, two flotillas of destroyers and submarines. The Red Fleet was to replenish the mobile base at Arosa Bay, represented by HMS Snapdragon and HMS Maidstone and defended by mines, submarines and a local defence flotilla.
A later exercise in Greek waters, 'N.A.S.F.' in August 1926 tested the practicality of the Mobile Base on a full-scale deployment.
Other exercises tested deploying the fleet to Singapore 35 days after a Japanese declaration of war. One concluded the Japanese could not secure Singapore before the arrival of the fleet, which Admiral Richmond, CinC East Indies questioned. He didn't think the Japanese would spend 12 days building an aerodrome.
Another simulated passage of the fleet through the Straits of Malacca. It was determined Queen Elizabeth, Barham and Marlborough had all received single torpedo hits, and CinC Mediterranean recommended 'adequate repair, docks, ammunition and store facilities should be available for the fleet on arrival on the far end'
p. 167
"In 1928, exercise 'M.U.2', beginning 15 March, saw over 80 ships from the Mediterranean and Atlantic Fleets test the concept of securing a decisive fleet action before Hong Kong, represented by Gibraltar, and Singapore, represented by the Spanish island of Alboran off the western coast of Algeria, succumbed to Japanese forces"
Some interesting passages on night fighting:
p.225
"The decision to not only accept battle at night, but, in fact, to seek it was established at long last because British naval supremacy could no longer be maintained by numbers alone and night-fighting appeared tailor-made for a Naval Service made up of effectively trained long-serving professionals....At best, Britain would be equal to an adversary in a future war, and could, indeed, be the weaker force."
p.226
"This last point was confirmed in a series of fleet exercises that sought to develop the necessary tactics to allow the British fleet to successfully engage an enemy force that enjoyed the advantage in long-range gunnery. With only Rodney and Nelson able to engage ships beyond 30,000 yards, and with US, Japanese, and German ships known to enjoy such an advantage in gunnery, the results were disquieting, to say the least. In April 1933, the Mediterranean Fleet tested the hypothesis in exercise 'R.R.' Red Fleet, consisting of five battleships, and enjoying a slight advantage in speed, but limited in firing its main armament to 23,800 yards, engaged Blue Fleet, a force of four battleships able to fire up to 32,000 yards. Both fleets were in equal in cruiser and destroyer forces, and while Red was able to dispose of Blue's cruiser force in short order, the engagement of the opposing battlefleets brought grief to Red. It is worth reporting a summary of the action at length:
11.The two battlefleets came in sight at 36,000 yards, and at 32,000 yards, Blue fired a few rounds. Red cruisers and destroyers then attempted to cover their battlefleet with smoke, but this did not prevent Blue deploying at a range of 29,000 yards, and beginning a four-ship concentration on Red Revenge...
12. Discounting the effect of Blue gunfire under these conditions, Red held his course for another twelve minutes, and then swung round to close at a maximum rate. After 40 minutes under fire, he was able to open his foremost turrets, at 23,700 yards, but in this interval Revenge had been destroyed.
13. With range down to 22,000 yards, Red turned to a parallel course to open his 'A' arcs. Blue promptly turned away together to open the range, leaving only his after turrets bearing, but Red followed at once. By this manoeuvre Blue had opened the range 800 yards, but Red was in pursuit, no advantage was to be gained by further retirement, and Blue turned back determined to close quickly to decisive range.
The assessment concluded by advising that:
15. Unless the fleet with the shorter range guns ha a large advantage in speed, or visibility is limited, the use of smoke appears to be essential in order to avoid damage, which may be serious, when closing a well-handled fleet armed with longer range guns.
In the following year, 1934, an expanded exercise, 'Z.J.', was conducted by the combined Mediterranean and Home Fleets on the question. This time of its five battleships, Red was allowed two whose maximum range exceeded 32,000 yards. They faced and equal number of Blue force battleships, all enjoying the advantage of long-range gunnery. If anything, the results were even more discouraging. Red Fleet lost two battleships"
p. 227
"outright, two others were disabled to 60 per cent and 25 per cent respectively, and Resolution was damaged but slightly. Blue Fleets losses included the sinking of Nelson and damage of 50 per cent and 25 per cent, respectively, to Malaya and Barham. "
An aside, but an interesting passage on the new battleship after the holiday expired:
p. 228
"The Service's willingness to accept a night action was an attempt to mitigate through tactics its increasing strategic naval inferiority. This inferiority only worsened as the period progressed, as the Service's ships could not be built to the dimensions of their rivals because of limitation in port facilities and the constraints represented by the Suez Canal. Such limitations had long been recognised, and the Admiralty noted even in 1913 the ability of a Queen Elizabeth-class battleship to navigate the Suez Canal was possible only if their oil tanks were nearly empty. Given the restricted displacements of the second King George V and Lion-classes of battleships, and their limited ammunition load of 80 and 60 rounds per gun respectively, an engagement fought at long range was no longer a tactical option for the Royal Navy. The only chance that British forces appeared to have was to seek a night or restricted visibility engagement and pass as quickly as possible through the danger zone."
Regards,