▁were ▁rem ount ed ▁on ▁the ▁upper ▁deck . ▁In ▁May ▁ 1 9 1 7 , ▁two ▁more ▁were ▁added ▁to ▁Duke ▁of ▁Edinburgh ▁on ▁the ▁forec ast le . ▁The ▁ship ' s ▁for em ast ▁was ▁converted ▁to ▁a ▁tri pod ▁m ast ▁to ▁support ▁the ▁weight ▁of ▁the ▁fire - control ▁director ▁probably ▁added ▁in ▁ 1 9 1 7 . ▁ ▁Sh ips ▁ ▁Service ▁ ▁Duke ▁of ▁Edinburgh ▁and ▁Black ▁Prince ▁served ▁in ▁the ▁Channel , ▁Atlantic ▁and ▁Home ▁Fle ets ▁before ▁World ▁War ▁I . ▁They ▁were ▁station ed ▁in ▁the ▁Mediter rane an ▁when ▁World ▁War ▁I ▁began ▁and ▁participated ▁in ▁the ▁purs uit ▁of ▁the ▁Go eben ▁and ▁Bres lau ▁as ▁part ▁of ▁the ▁ 1 st ▁Cru iser ▁Squadron , ▁but ▁was ▁ordered ▁not ▁to ▁eng age . ▁After ▁the ▁German ▁ships ▁reached ▁Ott oman ▁waters , ▁the ▁ships ▁were ▁sent ▁to ▁the ▁Red ▁Sea ▁in ▁mid - August ▁to ▁protect ▁tro op ▁con vo ys ▁arriv ing ▁from ▁India . ▁While ▁on ▁esc ort ▁duty ▁they ▁captured ▁three ▁German ▁merchant men . ▁ ▁The ▁two ▁sister s ▁rejo ined ▁the ▁ 1 st ▁Cru iser ▁Squadron ▁in ▁December ▁ 1 9 1 4 , ▁which ▁had ▁transferred ▁to ▁the ▁Grand ▁Fle et ▁and ▁participated ▁in ▁the ▁Battle ▁of ▁J ut land ▁in ▁May ▁ 1 9 1 6 . ▁Black ▁Prince ▁became ▁separated ▁from ▁the ▁fleet ▁when ▁darkness ▁fell ▁and ▁was ▁s unk ▁with ▁all ▁hands ▁by ▁German ▁batt les hips ▁later