cht ▁von ▁Ro on , ▁and ▁refused ▁to ▁allocate ▁funds . ▁Chan cell or ▁Otto ▁von ▁B ism ar ck ▁used ▁a ▁loop hole ▁to ▁secure ▁fund ing ▁for ▁Ro on ' s ▁re forms , ▁and ▁the ▁N ym phe ▁class ▁was ▁ordered ▁without ▁parliament ary ▁appro val . ▁ ▁N ym phe ▁was ▁completed ▁in ▁time ▁for ▁the ▁Second ▁Schles wig ▁War ▁with ▁Den mark ▁in ▁ 1 8 6 4 , ▁seeing ▁action ▁at ▁the ▁Battle ▁of ▁J asm und , ▁where ▁she ▁was ▁heavily ▁engaged , ▁but ▁only ▁slightly ▁dam aged ▁by ▁a ▁Dan ish ▁fr ig ate . ▁During ▁the ▁Franco - Pr uss ian ▁War ▁in ▁ 1 8 7 0 – 1 8 7 1 , ▁Med usa ▁was ▁block aded ▁in ▁Y ok oh ama , ▁Japan , ▁and ▁saw ▁no ▁action . ▁N ym phe ▁was ▁similarly ▁block aded ▁in ▁Dan zig , ▁Pr uss ia , ▁and ▁she ▁made ▁a ▁surprise ▁night time ▁attack ▁on ▁the ▁French ▁squad ron , ▁inf lic ting ▁no ▁damage ▁but ▁never theless ▁convin cing ▁the ▁French ▁adm iral ▁that ▁his ▁iron cl ad ▁war ships ▁were ▁un su itable ▁for ▁a ▁close ▁block ade ▁of ▁Pr uss ian ▁ports . ▁Both ▁ships ▁went ▁on ▁extended ▁cru ises ▁abroad ▁during ▁pe ac etime , ▁and ▁in ▁the ▁mid - 1 8 7 0 s ▁they ▁were ▁converted ▁into ▁training ▁ships . ▁In ▁this ▁gu ise , ▁both ▁vessels ▁continued ▁to ▁make ▁over se as ▁cru ises ; ▁Med