▁Ober k omm ando ▁der ▁Marine ▁( S up reme ▁naval ▁headquarters ), ▁to ▁attack ▁Con voy ▁SL - 6 7 . ▁During ▁this ▁attack , ▁U - 1 0 5 ▁s ank ▁the ▁merchant ▁ship ▁Har mod ius , ▁on ▁ 8 ▁March . ▁Collect ively , ▁the ▁two ▁U - bo ats ▁s ank ▁a ▁total ▁of ▁ 2 8 , 1 4 8 ▁tons . ▁U 1 0 5 ▁then ▁st alk ed ▁Con voy ▁SL - 6 8 , ▁s inking ▁Med jer da ▁ ▁on ▁ 1 8 ▁March , ▁Mand al ika ▁on ▁ 1 9 ▁March ▁ ▁and ▁Cl an ▁Og il vy , ▁Ben wy vis ▁and ▁J hel um , ▁ ▁all ▁on ▁the ▁ 2 1 st . ▁U - 1 0 5 ▁went ▁on ▁to ▁score ▁Naz i ▁Germany ' s ▁first ▁kill ▁off ▁the ▁coast ▁of ▁South ▁America ▁when ▁she ▁s ank ▁E na ▁de ▁L arr in aga ▁on ▁ 5 ▁April ▁ 1 9 4 1 . ▁Later ▁during ▁the ▁pat rol ▁she ▁s ank ▁Oak den e , ▁part ▁of ▁Con voy ▁O G - 5 9 . ▁On ▁ 6 ▁May , ▁Ben v rack ie , ▁part ▁of ▁Con voy ▁O B ▁ 3 1 2 ; ▁on ▁the ▁ 1 3 th , ▁Ben venue ▁part ▁of ▁Con voy ▁O B ▁ 3 1 4 ▁and ▁on ▁the ▁ 1 5 th , ▁Rod ney ▁Star ▁on ▁ 1 6 ▁May ▁and ▁Scottish ▁Mon arch