In the mid-1930s, in response to the threat posed by "pocket battleships," the YRN (Navy of Yan Republic) deemed it essential to develop a specialized embiggened cruiser. At the time, the naval treaties were still in effect, the modernization of the outdated World War I-era battlecruisers remained incomplete, and the limited number of high-speed treaty battleships was insufficient to counter the potent threat that pocket battleships posed to maritime supply lines. Moreover, the YRN was keen on leveraging the capabilities of this new vessel to disrupt enemy shipping lanes. The overall design specifications for the battlecruiser were as follows:
- Armor capable of withstanding the primary armament of pocket battleships.
- A top speed of 33 knots, adequate for pursuing treaty cruisers.
- Main armament featuring the 305mm main gun caliber from older battlecruisers.
- Extended range, ensuring over 12,000 nautical miles at cruising speed.
- Construction should not require the 220-meter slipways designated for battleships and aircraft carriers.
The de facto invalidation of the naval treaties enabled the construction of this class of battlecruisers to proceed. The navy secured the budget to build two such vessels, naming them Dahuang (大荒) — an important agricultural city — and Pingye (平野), its sister city.
The keel of the lead ship, YRN Dahuang, was laid down in Dec 1937, and launched in Nov 1939. Due to the length limitation of the dry dock, the bow section was installed after the completion of the main hull during the construction process. The onset of war expedited the construction process, which also led to the construction plans for subsequent ships being redirected towards the construction of the new batch of 2 high-speed battleships. YRN Dahuang was commissioned into service in Feb 1941. Thereafter, YRN Dahuang participated in numerous combat operations during World War II, primarily providing escort for aircraft carriers and offering artillery support for land operations. Her sister ship, YRN Pingye, engaged in a series of naval battles around the Pancaro Islands, where she demonstrated overwhelming superiority over treaty cruisers during night engagements. Despite their extensive service, however, neither of the two Dahuang-class battlecruisers ever encountered their anticipated adversaries — the pocket battleships — in actual combat. Both ships were decommissioned in 1953 and 1954, respectively, and were subsequently broken up in the 1960s.
Specifications (YRN Dahuang in 1945), evaluated by SpringSharp:
Displacement: 21,765 tons (standard); 26,473 tons (full load)
Dimensions: length 215.0 m; beam 24.7 m; draught 8.3 m
Propulsion: 4-shaft steam turbines, double-reduction gearing, 12 boilers with 138,000 horsepower
Speed: 33.10 knots maximum
Endurance: 14,000 nmi at 14 knots
Armament:
6 x 305mm/50 caliber main guns in triple-mount
6 x 155mm/55 caliber secondary guns in triple-mount
12 x 105mm/50 caliber secondary dual-purpose guns in twin-mount
50 x 40mm/65 caliber AA guns
26 x 25mm/60 caliber AA guns
Armor:
Belt: 220mm/12°
Deck: 25mm + 85mm
Main Turrets: 305mm face, 160mm side
Conning Tower: 220mm