The design spectrum separates the lightly protected cruiser-killer from battlecruisers expected to fight their peers, conventional battleships, and the later fast-battleship compromise. Internal subdivision and intended combat role matter as much as nominal armor thickness. A coastal-defence battleship marks the other extreme, sacrificing speed so that armor and firepower can dominate a restricted position. The rebuilt Kongos sit near the disputed boundary because Japan increasingly treated them as capital-ship escorts able to help hold off enemy heavy units.
Chapter · 14:19-22:07
Battlecruisers, fast battleships, and the rebuilt Kongos
A design spectrum explains how mission, internal subdivision, protection, and speed distinguish battlecruisers from fast battleships, then applies the test to Japan's rebuilt Kongo class.