▁She ▁was ▁commission ed ▁into ▁the ▁German ▁Imperial ▁Navy ▁on ▁ 2 5 ▁August ▁ 1 9 1 6 ▁as ▁SM ▁U B - 4 1 . ▁ ▁The ▁sub marine ▁s ank ▁eight ▁ships ▁in ▁th ir teen ▁pat rol s . ▁They ▁included ▁the ▁William ▁C ory ▁and ▁Son ▁col lier ▁, ▁which ▁U B - 4 1 ▁tor ped o ed ▁in ▁the ▁North ▁Sea ▁off ▁Robin ▁H ood ' s ▁Bay ▁on ▁ 8 ▁September ▁ 1 9 1 7 . ▁U B - 4 1 ▁was ▁struck ▁by ▁a ▁mine , ▁possibly ▁a ▁German ▁one , ▁and ▁s ank ▁in ▁the ▁North ▁Sea ▁on ▁ 5 ▁October ▁ 1 9 1 7 . ▁ ▁Sum mary ▁of ▁ra iding ▁history ▁ ▁References ▁ ▁Notes ▁ ▁Cit ations ▁ ▁Bibli ography ▁▁▁▁▁ ▁Category : 1 9 1 6 ▁ships ▁Category : Sh ips ▁built ▁in ▁Hamburg ▁Category : World ▁War ▁I ▁sub mar ines ▁of ▁Germany ▁Category : G erman ▁Type ▁U B ▁II ▁sub mar ines ▁Category : U - bo ats ▁commission ed ▁in ▁ 1 9 1 6 ▁Category : Mar itime ▁inc idents ▁in ▁ 1 9 1 7 ▁Category : U - bo ats ▁s unk ▁in ▁ 1 9 1 7 ▁Category : U - bo ats ▁s unk ▁by ▁mines ▁Category : World ▁War ▁I ▁ship w re cks ▁in ▁the ▁North ▁Sea ▁Category : Sh ips ▁lost ▁with ▁all ▁hands ▁Category : Pro te cted ▁W re cks ▁of ▁the ▁United