ate ▁was ▁also ▁equ ipped ▁with ▁a ▁dozen ▁Q F ▁ 1 2 - p ound er ▁ 1 2 - c wt ▁guns ▁and ▁eight ▁Q F ▁ 2 . 5 - p ound er ▁Yam au chi ▁guns ▁as ▁close - range ▁defense ▁against ▁tor ped o ▁boats . ▁The ▁ship ▁was ▁equ ipped ▁with ▁four ▁sub mer ged ▁ ▁tor ped o ▁tub es , ▁two ▁on ▁each ▁broad side . ▁ ▁All ▁of ▁the ▁" S ix - S ix ▁Fle et " ▁arm ored ▁cru is ers ▁used ▁the ▁same ▁arm or ▁scheme ▁with ▁some ▁minor ▁differences . ▁The ▁water line ▁bel t ▁of ▁Kru pp ▁c ement ed ▁arm or ▁ran ▁the ▁full ▁length ▁of ▁the ▁ship ▁and ▁its ▁thick ness ▁varied ▁from ▁ ▁amid ships ▁to ▁ ▁at ▁the ▁bow ▁and ▁stern . ▁It ▁had ▁a ▁height ▁of ▁, ▁of ▁which ▁ ▁was ▁normally ▁under water . ▁The ▁upper ▁stra ke ▁of ▁bel t ▁arm or ▁was ▁ ▁thick ▁and ▁extended ▁from ▁the ▁upper ▁edge ▁of ▁the ▁water line ▁bel t ▁to ▁the ▁main ▁deck . ▁It ▁extended ▁ ▁from ▁the ▁forward ▁to ▁the ▁rear ▁bar b ette . ▁The ▁Iz um o ▁class ▁had ▁ob lique ▁ 1 2 7   mm ▁arm ored ▁bulk head s ▁that ▁closed ▁off ▁the ▁ends ▁of ▁the ▁central ▁arm ored ▁cit adel . ▁ ▁The ▁bar b ettes , ▁gun ▁tur rets ▁and ▁the ▁front ▁of ▁the ▁cas em ates ▁were ▁all ▁ 6 ▁inches ▁thick ▁while ▁the