▁to ▁the ▁block ade ▁of ▁Argentina , ▁he ▁vig or ously ▁attacked ▁the ▁Brazil ian ▁coast , ▁sh atter ed ▁Brazil ian ▁sh ipping ▁and , ▁at ▁the ▁hard - f ought ▁Battle ▁of ▁Jun cal ▁( 2 4 ▁February ▁ 1 8 2 7 ), ▁destroyed ▁the ▁entire ▁oppos ing ▁Brazil ian ▁squad ron , ▁with ▁seven ▁ships ▁and ▁eight ▁ 1 - gun ▁launch es . ▁He ▁also ▁took ▁its ▁commander ▁prisoner . ▁On ▁ 1 1 ▁June ▁ 1 8 2 6 , ▁the ▁Battle ▁of ▁Los ▁Poz os ▁took ▁place ▁between ▁the ▁Argent ine ▁and ▁Brazil ian ▁forces ▁in ▁view ▁of ▁Buenos ▁Aires , ▁Argentina ▁having ▁only ▁eleven ▁ships ▁as ▁opposed ▁to ▁Brazil ' s ▁thirty - one ▁war ships . ▁Later , ▁he ▁fought ▁in ▁the ▁Battle ▁of ▁Monte ▁Santiago , ▁and ▁peace ▁of ▁a ▁sort ▁followed , ▁with ▁Brown ▁acting ▁as ▁Argent ine ▁commission er ▁when ▁the ▁Tre aty ▁of ▁Monte video ▁was ▁signed ▁on ▁ 4 ▁October ▁ 1 8 2 7 . ▁ ▁War ▁with ▁Uruguay ▁▁ ▁F action al ▁disput es ▁within ▁Uruguay ▁led ▁Argent ine ▁leader ▁Juan ▁Manuel ▁de ▁Ros as ▁to ▁support ▁his ▁friend , ▁the ▁de posed ▁Uruguay an ▁president ▁Manuel ▁Ori be , ▁in ▁the ▁civil ▁war ▁between ▁the ▁Blan cos ▁( support ing ▁Ori be ) ▁and ▁the ▁Color ados . ▁Brown ▁returned ▁to ▁active ▁service ▁and ▁defeated ▁his ▁former ▁officer ▁John ▁Co e ▁in ▁three ▁engag ements ▁near ▁Monte video . ▁On ▁ 1 5 ▁August ▁ 1