 Markgraf then fired on the battlecruiser Princess Royal and scored two hits . The first hit struck the 9 @-@ inch armor covering " X " barbette , was <unk> downward , and exploded after penetrating the 1 @-@ inch deck armor . The crew for the left gun were killed , the turret was disabled , and the explosion caused serious damage to the upper deck . The second shell penetrated Princess Royal 's 6 @-@ inch belt armor , <unk> upward off the coal bunker , and exploded under the 1 @-@ inch deck armor . The two shells killed 11 and wounded 31 . At the same time , Markgraf 's secondary guns fired on the cruiser Warrior , which was seriously damaged by 15 heavy shells and forced to withdraw . Warrior <unk> on the trip back to port the following morning . 
