 Northumberland was partially rearmed in 1875 with an armament of 7 nine @-@ inch guns , 4 on the main deck , 2 forward chase guns and 1 rear chase gun . Two eight @-@ inch guns replaced the seven @-@ <unk> on the main deck at the stern ; the other 18 eight @-@ inch guns remained where they were . In 1886 two six inches ( 152 mm ) breech @-@ loading guns replaced two eight @-@ inch guns . Six quick @-@ firing ( QF ) 4 @.@ 7 @-@ inch ( 120 @-@ mm ) guns , 10 QF 3 @-@ pounder Hotchkiss guns , and six machine guns were later added . 
