so, here it comes also the massive Yoshino Class Battleship.
(history courtesy of emperor_Andreas, refit details by me)
When commissioned starting in May 1929, the Yoshino-class battleships were the most powerful warships in the world, and the first battleships ever to mount 18-inch guns. Due to secrecy, the U.S. Navy did not discover the true size and armament of these monsters until 1934, and immediately made plans to speed up construction of their own battleships to compensate. Yoshino herself initially sported eight 24-inch torpedo tubes, but after trials she was discovered to be dangerously overloaded; deletion of the torpedo tubes fixed the problem and her five sisters were completed without them.
Yoshino after the torpedo tubes removal (for former configuration just check the real n°13 class
Between september 1937 and april 1942 all six Yoshino clas sships underwent a massive reconstruction, the biggest and most complex ones ever underwwnt by an IJN warship, the first to enter drydock was IJN Oshima in september 1937, the last one Tsuruga in July 1938, and all but one where handed back to the navy just in time for the start of the war.
Yoshino: march 1938 to november 1941
Oshima: september 1937 to may 1941
Asahi: november 1937 to june 1941
Kitami: march 1938 to december 1941
Tsuruga: july 1938 to april 1942
Iwami: january 1938 to november 1941
The refit was immense, the waterline lenght increased to 275,25 meters, an addition of 8,5 while overall lenght reached 280,71, torpedo bulges added 3,2 meters to the beam to 34 meters, dispalcement rose by nearly 8.000 tons to 64.706 at full load, new all-oil-fired boilers and machinery kept maximum speed at 30 knots, Oshima actually reached 30,3 knots during post-reconstruction sea-trails; four twin 127mm/40 Type 89 anti-aircraft gun mounts superseeded the older 120mm ones, 10 twin and two triple 25mm machine guns where also added for light anti-aircraft defense, a twin variant of the by then under construction Yamato class guns was also manifactured for the Yoshino class, the new turrets where capable of 45° barrel elevation to the older 30°, this increased range from 36.000 yards (32.920 meters) to 45,960 yards (42,030 m), a massive 15-meter rangefinder and director tower similar to those fitted on the Yamato class ships was also added on top of the massive heptapodal mast, wich was rebuilt in a gigantic pagoda, it towered almost 54 meters above the waterline at the top of the main gun director, it was so massive that even the huge Fuso class superstrucutre looked small in comparision.
the aft superstructure was also rebuilt housing more fire-control platforms and the auxiliary main gun director this also from the same model to be mounted on the Yamato class, when machinery space was upgraded the funnel was also shifted furter back to make space for the enormous pagoda mast and in order to better clear the moke from the bridge platforms, the funnel was also engulfed by the searchlight and high-angle-gun directors suite; aircraft handling was fitted at the stern and two Nakajima E8N embarked, complement at the start of the war was 2.541 officers and sailors.
Yoshino in December 1941 at the start of the war, fresh from her main reconstruction
On 26 May 1942, Asahi was sighted by submarine U.S.S. Salmon as she steamed from Singapore to Kure. Incredibly, the ship's only escort were destroyers Namikaze and Nokaze; the IJN believed that the armor of a Yoshino-class battleship was able to stop any serious damage from being incurred, and decided not to send more escorts for such an important capital ship. As the refits to the Yoshinos were not known, Salmon's skipper - having only a pre-refit Yoshino-class drawing to go by - listed his target as a 'Tosa-class battleship' and fired four torpedoes at Asahi. All four torpedoes hit and three exploded, one abreast the forward magazine, the second below the massive bridge pagoda, and one abreast the funnel. Believing his ship could continue, Captain Tamura Ryukichi ordered the voyage to Kure resumed once the flooding was contained; however, the repairs could not hold against the strain of 27 knots, and flooding resumed within two hours. Three hours after being hit, a bulkhead within the ship gave way, and the starboard list dramatically increased. The massive pagoda bridge did not help matters, as it hung over the water and threatened to capsize the massive warship. Bowing to the inevitable, Captain Tamura ordered 'Abandon Ship', and the crew was transferred to the two escorting DDs. About ten minutes after Captain Tamura - who was the last man off - departed, Asahi rolled onto her starboard side and sank bow-first. Incredibly, only sixteen crewmen were killed.
The rest of the class survived until the Battle of Leyte Gulf in October 1944. Oshima was behind battleship Shinano when she was rammed by large cruiser Nantai, and made an emergency turn to starboard to avoid becoming the third ship in the collision. Her port side was only 500 yards away (point-blank range) when Nantai suddenly exploded, sending a wall of shrapnel hurtling towards Oshima; in seconds everyone in an exposed position on the port side was either killed or seriously injured, and the port superstructure looked like "metallic Swiss cheese" in the words of crewmen from destroyer Tanigiri, many of whom were sickened by the sight of the battleship's decks literally painted red with human blood. The underwater concussion also hit Oshima hard, snapping her keel and mortally wounding her. Knowing there was no way to repair his ship, her Captain ordered her abandoned. As she slowly sank, battleship U.S.S. North Carolina opened fire on her, adding to the carnage; her final casualties were 466 dead and 537 wounded, nearly half of the crew.
Kitami slugged it out with both U.S.S. New Jersey and U.S.S. Kentucky, and managed to land a killing blow on the former, sending an 18-inch shell straight through her forward magazines and sinking her with only 130 survivors. Enraged by the destruction, eight U.S. destroyers made the first of several torpedo runs against the Japanese fleet. Two destroyers launched their torpedoes directly at Kitami from about 1,100 yards, being pounded by the Japanese battleship's secondary guns the entire time. Twenty torpedoes sped towards the Japanese battleship, but destroyer Yamagiri deliberately placed herself in the path of several. Five torpedoes slammed into her in quick succession; she disintegrated with her entire crew. Battle cruiser Atago inadvertently stopped three more; a navigational error put her directly in their path, and she limped off, trailing oil from a leaking fuel bunker, only to be pounded into submission by battleships Alabama and Missouri later on. The final act of sacrifice was made by battle cruiser Hitachi, which sped up and placed herself directly in front of Kitami. As both American and Japanese crews alike watched in horror, at least eight torpedoes ripped her apart, sinking her in seconds with only eight survivors. But even this sacrifice failed to prevent Kitami from being damaged, the remaining four torpedoes slammed into Kitami's bow and stern, the latter hits taking out her propellers and rudder, making her easy prey for BBs Massachusetts, Iowa, and Illinois to finish off. She sank just before sunset with heavy casualties, firing salvos to the very end.
Yoshino as she looked during the Philippine Campaign, with revised airwing, upgraded radar suite and anti-aircraft suite increased; two 5.5-inch casemate guns where removed and four 127mm/40 Type 89 AA guns in twin mounts where added, the 25mm machine guns reached a total of 146 in 10 twin and 42 triple mount, complement increased to at least 2.901 men, including AA crews
The three remaining vessels - Yoshino, Tsuruga, and Iwami - were all damaged in the Battle of Leyte Gulf, but survived to escape back to Japan in late 1944. In June 1945, Iwami attempted to run from Yokosuka to Kure escorted only by destroyers Taekaze, Satokaze, and Murakaze, only to be sunk by submarine U.S.S. Archerfish. In April 1946, Yoshino departed Sasebo for Maizuru, but struck a mine and had to return to port, effectively knocking her out of the war. Tsuruga remained anchored in Maizuru from February 1945 onward, and greeted the surrender there. These two battleships, along with Nagato and Kawachi, became the core of the IJN's training fleet post-war.