By 1828 the Cisplatine War had been fought to a stalemate with Argentina's fleet destroyed, its land forces unable to capture any major cities,[REF] and Brazil suffering a temporary lack of manpower for a full-scale land offensive against Argentine forces.
With these considerations in mind, Posonby made a proposal for an independent Uruguay to placate both Brazil and Argentina in order to reestablish peace on La Plata, and conceded to the Brazilian demands regarding its sovereignty over the Missões Orientales and the right to freely navigate in the Plata River.