The game-derived Defence is described with a 229 mm main belt, a four-inch citadel deck and a 40 mm weather deck. The assessment is that this would trouble conventional cruisers while still falling short of protection for fighting capital ships directly. That combination is compared with the original battlecruiser idea. The panel then imagines a smaller group of six to eight Defences, and a mixed substitution using Minotaurs for lighter cruisers, as less uniform versions of the same scenario.
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Defence's game armor and the battlecruiser role
The stated armor scheme is used to distinguish overpowering cruisers from standing in a capital-ship gun battle.