 Kapitänleutnant Erich von Rohrscheidt assumed command of UB @-@ 42 on 6 April 1918 , and six week later , led the U @-@ boat in capturing the motor sailing vessel <unk> as a prize six weeks later off Novorossisk . In September , Kapitänleutnant Hans Georg <unk> ( who had succeeded Herbert Nolde after his two @-@ month stint as commander of UB @-@ 42 ) led the U @-@ boat in sinking her final ship . On the night of 7 / 8 September , the 1 @,@ 833 @-@ ton Italian steamer Vicenza was sent down south of Salonica . UB @-@ 42 's commanding officer was changed twice more before the end of the war , but the submarine sank no more ships . 
