 Nyorai kupfuurira kweiyi ndima - OBrien akasimudzirwa kuva mutungamiri musi wa 22 January 1813 uye akasiya Bacchante muna April, achidzokera kuEngland semutakurwi paThunder yaWatkin Owen Pell. OBrien akanga asina mutungamiri kusvikira muna 1818 asi muna 1814 akabudisa nhoroondo yekuparara kwake pa Hussar uye kutiza kwake kwakazotevera kuTrieste. Muna 1818, pashure pokuguma kweHondo dzaNapoleon, akagadzwa kuti atungamirire 20-gun HMS Slaney. Akashanda paSouth America Station uye, pashure pokunge Admiral Sir Thomas Hardy atumirwa kumadokero, akanga ari mukuru mukuru pamhenderekedzo yeAtlantic yechiteshi ichi. OBrien akabata basa iri munguva yekutanga yeArgentina Civil Wars, nguva apo Buenos Aires yakanga iri muhondo nemapurovhinzi akapoteredza. Akabudirira kunyengetedza hurumende yeBuenos Aires kuti irege kuenderera mberi nechinangwa chayo chokunyora vagari veBritain muuto rayo uye kutora zvinhu zvavo. OBrien akasimudzirwa kuva kaputeni musi wa 5 Kurume 1821 uye akabva kuSouth America muna Gumiguru, achidzokera kuBritain ari mungarava yainzi Owen Glendower. 