Oribe's advance on Montevideo brings the conflict to a point at which Britain threatens to intervene directly. In this account, an American representative proposes amnesty for Rivera's supporters, elections, and the withdrawal of Argentine forces. British representatives reject his mediation as biased and warn that an attempt to enter Montevideo will meet force. Their ultimatum allows ten days for Oribe's army and William Brown's navy to leave Uruguay. Failure to comply would bring a blockade of Buenos Aires, extending British action beyond relieving Montevideo.
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The ultimatum over Montevideo and the threatened blockade of Buenos Aires
The Montevideo crisis brings competing diplomatic proposals and a British threat to blockade Buenos Aires if Argentine forces remain in Uruguay.