 SM UB @-@ 50 began her second patrol with the sinking of the Marc Fraissinet , a 3 @,@ 060 GRT French steamer carrying wood , munitions , and hay to Bizerte . It sank 15 nautical miles ( 28 km ; 17 mi ) north of Tabarca after being torpedoed by UB @-@ 50 . Later that day UB 50 encountered the Senegal , an 845 GRT Italian steamer , sinking her off the coast of Algeria with no casualties . Three days after that , the Margram Abbey , a 4 @,@ 367 GRT British steamer carrying coal , was found and torpedoed by UB @-@ 50 . It was beached off of the coast of Algeria , but the torpedo damage , which killed two , had wrecked the ship . UB 50 attacked the Antaeus , a 3 @,@ 061 GRT British steamer , three days later off of Cape Bon . There were no casualties , but the captain was taken prisoner . On the following day , UB 50 torpedoed the Amberton , a 4 @,@ 556 GRT British steamer , but she was only damaged . Four days later , the submarine found her last target of her second patrol , the 2 @,@ 774 GRT American steamer Rizal , which sank 9 nautical miles ( 17 km ; 10 mi ) from Cape Cavallo . 
