Not even a year after the signing of the Treaty of New York which brought an end to the Great War the United States along with the British, German, and Japanese Empire had all started major naval building programs and it seemed another naval arms race was starting after one helped led to a major war. This was followed by the start of a naval program by Austria-Hungary in 1921 and Italy in 1922 that was spur on by the Austria-Hungary program. There were also signs that French who was just exiting out its civil war would also start a major naval program in 1923 or 24 time frame. However, the cost of such a naval race was insanely high and after everything that happened in the war and after it budgets were tight. People across the globe had no wanted to fight another war. The people in the US were very keen on the idea of cutting cost defense spending.
There was only one way to control the cost of the budget, a naval arms control treaty. Even through the US had won the war the British weren’t defeated and many within the high levels in Washington believe they would seek a war of revenge if they saw a chance. They were stilled allied to the Japanese as well. Because of this they still faced threats on both the Atlantic and Pacific Fronts. Further the leaders weren’t about the US to be defenseless against either power to cut the defense budget. Secretary of State Elihu Root a holdover from the Roosevelt White House and by 1922 the longest holder of the job as Secretary of State started laying the groundwork for a naval arms control treaty. To the surprise of Root and others in Foggy Bottom Sound they found many nations were receptive to the idea. This was also because they were all running into budget issues and needed a way to release funds to help get their budgets back under control.
Bern was selected as the city for the meeting to be held. It was something of an irony that a nation with no borders with the sea would hold such a major naval conference that would affect navies worldwide. Many different topics were covered at Bern with many days and weeks of back and fore on the different issues that were covered by such a far reaching treaty as the Bern Naval Treaty was too be. Yet Bern would set the tone of navies worldwide till the treaty system fell part in the lead up to World War II.
The big fight at Bern was over the tonnage of capital ships and what defined a capital ship. After many days of back and fore on the issue before an agreement was reached. Capital ships were defined as pre and post Colossus battleships, battlecruisers, armored cruisers, and sometimes monitors. The final agreement on tonnage came to a ratio of 11:11:8:7:3:3:3. This ratio was set up from top down and at the top was the United States and the British Empire. Following the British it was the German Empire than Japanese Empire with the Third French Empire, the Italian Kingdom, and the Austro-Hungarian Empire bring up the rear. The Imperial Federation of Australia and New Zealand and South Africa was to count against British tonnage limits. Further each nation would be allowed to maintain two reserve capital ships that would not count against the tonnage limits. These ships could only maintain a skeleton crew year around to keep up with simple maintenance. Finally these reserve capital ships could only put to sea for one week a year with all nations of this treaty being told about a month in advance about this training sortie for their reservist crews.
Bern also start the birth of the treaty battleship and battlecruisers. These ships were limited to a standard displacement of 45,000 tons with guns no bigger than 16.5 inches. It further limited the big four at Bern to the number of capital ships they could have in the difference phases of construction. The US, the British, Germans, and Japanese were limited to just have two capital ships being built at any one time with the French, Italians, and Austro-Hungarians being limited to a single capital ship being built. This was to replace 20 year or older battleships or in some cases allowing nations to fill out their tonnage limits per the treaty. When a new capital ship is ordered all singers of this treaty would be informed about it. The ship being replaced by this new construction had to be in the breaker yards by the time this new ship was to be commissioned into the navy of the nation in question. Or the reserve ship was to be in the breaker yards with a former active ship being moved to reserve status.
Each nation may take one ship that was to be scrapped under the terms of this treaty and turn it into a gunnery training ship. These ships would have to have its armor, main guns, and anti-torpedo defenses removed. The British were allowed to keep HMS Colossus as a museum ship. Japan was allowed to keep IJN Mikasa as a museum ship. Germany was allowed to keep SMS Moltke[1] as a museum ship. The United States was allowed to keep USS Delaware as a museum ship. All museum ships were to be demilitarized. Ships that are to be scrapped under the terms of this treaty could not be sold to third party nations. However, the turrets and guns of these ships could be placed into storage, used for coastal defensives, new builds or however the nation saw fit.
This treaty also banned the building of capital ships for foreign powers. This came into effect once the treaty reached a two-thirds ratification point. This set off a rush by the Belgians, Dutch, Greeks, Ottomans, Brazilians, Argentinians, and Chileans to order capital ships for their navies before the two-thirds ratification point was reached. So, long as a contact was signed before that, those ships could be built. This saw 18 capital ships[2] being ordered by seven nations within the span of months before the two-third ratification point was reached.
For the Big Four at Bern they could take two of their battleships or battlecruisers that were being built at the moment and turn them into aircraft carriers that would had otherwise been scrapped under the terms of this treaty. These ships were limited up to 45,000 tons standard displacement with a limited up to four large caliber guns ranging from 5.1 to 8.3 inches in size. Italy, Austria-Hungary, and France can all turn one into an aircraft carrier if they so wish with the same limits of the Big Four. Aircraft Carrier tonnage was to be limited to a ratio of 6:6:4:4:1.5:1.5:1.5 ratio. Following these rebuilt battleships or battlecruisers that were turned into aircraft carriers, future carriers would be limited to 35,000 tons but retain the same limit on large caliber guns as their larger 45,000 ton counterparts have.
There however were loopholes both with the capital ships and aircraft carrier tonnage rules. For capital ships this was monitors. Monitors were to be limited to 10,000 tons standard displacement with a max of two 16.5 inch guns with no more than four secondary guns ranging in size from 5.1 to 8.3 inches. These ships would count against capital ship tonnage limits. However, if a monitor was under 5,000 tons standard displacement with main guns under 12 inches wouldn’t be counted against capital ship tonnage limits. For the aircraft carrier loophole, it was carriers that displaced 13,000 tons or less that wouldn’t be counted against the tonnage limits of the nation that built them. These light aircraft carriers were limited through just two guns between 5.1 and 8.3 inches instead of four like their larger sisters.
Another new ship was born at Bern, the Treaty Cruiser. Treaty cruisers were limited to a standard displacement of 13,000 tons and main guns of 8.3 inch in size. Efforts were made at Bern to have a cruiser tonnage limit for all parties but this was a bridge too far and no tonnage limits set at Bern. Even reaching this agreement was tricky but in the end an agreement was reached.
There were also a few other efforts at Bern that failed. Talks of not building up new Pacific fortications failed as it proved to be too much to agree to a comprise between the parties in the Pacific. The British tried to bring up submarine limits and hinted they would like a tonnage limit for submarines. Everyone else at Bern when no to any talks on submarines. They had proven their worth in the war and cheap when put up against the ships most parties at Bern had come here to talk about. Nothing was even touched on about destroyers. Yet by the time the ink was drying on this treaty a new naval race was already starting because it, the cruiser race.
[1] Germany’s first Battlecruiser ITL.
[2] The Belgian got two, the Dutch four, the Greeks two, the Ottomans two, the Brazilians four, the Argentinians two, and the Chileans two.