 Princess Royal hit Derfflinger once , but only forced in a pair of armour plates that flooded a coal bunker . She also hit Blücher at least twice , including the hit that crippled her , but having fired a total of 271 13 @.@ 5 @-@ inch shells during the battle this gave the Princess Royal a hit rate of only 0 @.@ 7 % . She also fired two 13 @.@ 5 @-@ inch shrapnel shells at the German airship L5 as it attempted to bomb the sinking Blücher , thinking that it was a British ship , despite the fact that the maximum elevation of those guns was only 20 ° . Princess Royal was not damaged during the battle . 
