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Notes: One of the main lessons the IJN learned from the Battles of the Coral Sea and Midway was "you can't have enough scout planes." After being seriously damaged during the Midway campaign, Mogami was extensively refit as a reconnaissance cruiser. Sometimes called a cruiser-carrier "hybrid", she was actually converted into a Tone-class type cruiser with a larger complement of seaplanes. It wasn't easy finding a configuration and cost/value slot for this cruiser. Tone is widely considered a "Set 1 over cost" while her sister Chikuma is a very popular unit that boosts the preferred IJN long-lance torpedo attack for a lower cost. It was very clear to us that we didn't want to interfere with the power/cost value of Chikuma, but it became equally clear we couldn't do the same for Tone. So we decided to fill a value/cost slot slightly above Chikuma, and let Tone be what she already is. At least this way those that like to recost old cards have a spot to simply drop the cost of Tone just below Chikuma without worrying about running into A-Go Mogami. (Pun intended.)
The Mogami-class were a class of four warships built initially for the Imperial Japanese Navy (IJN) as light cruisers in the early 1930s under the weight and armament restrictions of the London Naval Treaty. After Japan refused to comply any longer with that agreement, all four ships were rearmed with larger caliber main armament and were reclassified as heavy cruisers. All four fought in World War II, and were sunk.
The Mogamis have been seen by naval architects as a design failure. The IJN's Naval staff insisted that each new class be superior to anything else in its category, yet designers strove to stay in compliance with treaty regulations. As a result, the initial construction of these ships was overly light; within their first few years of service, all four had to be reconstructed to remain seaworthy. They were also unstable seaboats due to excessive topweight and their welded seams cracked under the stress of firing their own main guns.
For the 1931 Fleet Replenishment Program, believing themselves understrength in cruisers, the IJN chose to build to the maximum allowed by the Washington Naval Treaty. This resulted in the choice of 155 mm (6.1 in) guns in five triple turrets (a first for Japan) in the Mogamis, also capable of 55° elevation, making the Mogamis one of the very few classes of cruiser to have a dual purpose (DP) main battery; this was coupled with very heavy anti-aircraft protection, as well as the standard reloadable, turreted torpedo launchers, also unique to the IJN.
To save weight and improve transverse stability, the class was given a more compact and lower superstructure, electric welding was used, as was aluminium in the superstructure. Aiming to meet the weight limits compelled them to fit only ten boilers (compared to twelve in the previous Takao and Myoko classes), trunked into a single funnel stack (which also saved tophamper). The new geared impulse turbines added 22,000 shp over Atago, increasing the top speed by 1.5 knots (2.8 km/h). Protection, however, was not stinted on; the class proved able to take substantial punishment.
Although legend has it that Japan was founded in 660BC, archaeologists agree that settlement in the Japanese archpelago dates back as far as 100,000 years. The Jomon Period (8000-c.300BC) is the earliest that has been studied. It is named after the 'jomon' or cord-marked pattern style of pottery of the period.