a close to the civil war or in seeking to comply with Brazil's demands. The main factor, as historian Jeffrey D. Needell summarized, was that the "Uruguayan president had been unwilling to resolve these, particularly because the Brazilians whose grievances were at issue were allies of Venancio Flores, a client of the Argentines, and a man who was seeking his overthrow." A mutual enmity between Brazil and its Hispanic-American neighbors compounded the difficulties, the result of a long-standing distrust and rivalry between Spain and Portugal that had been carried over to their former American colonies. Brazil and Uruguay exhibited loathing for one another; as Robert Bontine Cunninghame Graham put it: "the Brazilians holding the Uruguayans as bloodthirsty savages, and the Uruguayans returning their contempt for the unwarlike ways of the Brazilians, whom they called monkeys, and looked down upon, for their mixed blood." Eventually, in July 1864, Saraiva's persistent diplomacy moved the Uruguayan government to agree to mediated talks including Edward Thornton (the British resident minister in Buenos Aires), Argentine foreign minister Rufino de Elizalde and Saraiva himself. Initially, the negotiations seemed promising, but soon bogged down. On 4 August, convinced that the government in Montevideo was unwilling to work toward a settlement, a frustrated Saraiva delivered an ultimatum, which the Uruguayans rebuffed. On 10 August, Saraiva informed Aguirre that the Brazilian military commanders would receive orders to begin retaliation, marking the beginning of the war. Alliance with rebel Colorados Under the orders of Vice-Admiral Joaquim Marques Lisboa (Baron of Tamandaré), a Brazilian fleet was stationed in Uruguayan territorial waters. The naval force comprised twelve steamships: one frigate, six corvettes and five gunboats. On 11 August 1864, Tamandaré, as the commander-in-chief of Brazilian naval and land forces in the war, received orders from Saraiva to begin retaliatory operations. Brazilian warships were deployed to the Uruguayan towns of Salto, Paysandú and Maldonado, ostensibly to "protect Brazilian subjects", while Uruguay's only warships, the small steamers Villa del Salto and General Artigas, were to be neutralized. When Tamandaré demanded these steamships remain at their docks, only the crew of General Artigas complied. Tamandaré created a naval command assigned to Captain of Sea and War Francisco Pereira Pinto (later Baron of Ivinhema). Consisting of two corvettes and one gunboat, the division was sent to patrol the Uruguay River, a tributary of the Río de la Plata and part of the Platine region. On 24