HMS Warrior carried a mixture of 110 @-@ pounder 7 inch ( 180 mm ) breech @-@ loading rifles and more traditional 68 @-@ pounder smoothbore guns . Warrior highlighted the challenges of picking the right armament ; the breech @-@ loaders she carried , designed by Sir William Armstrong , were intended to be the next generation of heavy armament for the Royal Navy , but were shortly withdrawn from service .