 Shortly before her sixth patrol , Oberleutnant zur See Heinrich <unk> took over command from Kptlt . Becker . On her sixth patrol , UB @-@ 50 encountered the <unk> , a 2 @,@ 514 GRT British steamer and torpedoed her south of Cape St. Maria di Leuca , though she survived . Three days later , UB @-@ 50 sank the War Swallow , a 5 @,@ 216 GRT British merchant ship carrying coal from the River Tyne to Port Said . Another three days passed before UB @-@ 50 found her next target , the Italian steamer Adria 1 , a ship carrying cotton from Palermo to Tunis . It sank , but no lives were lost . Two days later , the 5 @,@ 257 GRT British steamer <unk> was torpedoed by UB @-@ 50 killing three , but was only damaged . UB @-@ 50 sank the <unk> , a 3 @,@ 883 GRT British coal steamer two days later , sinking the ship and killing one . The following day , she torpedoed the Rutherglen , a 4 @,@ 214 GRT British steam merchant carrying coal . That was followed by an attack on the Magellan , a 3 @,@ 642 GRT British steamer on the following day . She sank with one man . The last ship sunk on the patrol was the Antonio S. , a 153 GRT Italian sailboat sunk off of the coast of Tunisia . 
