Against Brazil Lopez had serious cause of complaint. The boundary question was still unsettled and his possession of the Lower Paraguay placed the great province of Matto Grosso at his mercy, while the existence of that province, geographically a mere northern extension of Paraguay, was a menace to his own safety. Against the Argentines his hatred was not so well founded, but none the less bitter. The usual civil war was going on in Uruguay in 1863. The party which held the capital was out of favour at Rio and at Buenos Aires, and Brazil and Argentine were both inclined to support the pretensions of Flores, who led the revolutionists. Lopez thought that his own interests were concerned and asserted his right to be consulted as to Uruguayan affairs. A mighty shout of laughter went up from the Buenos Aires press at the pretensions of the cacique of an Indian tribe to the position of guardian of the equilibrium of South America. Brazil ignored his protests and calmly went on with her preparations to establish her protege in Montevideo. In the beginning of 1864 Lopez began active preparations for war. His army already numbered twenty-eight thousand men, and by the end of August sixty-four thousand more had been enrolled and drilled. Although ill provided with artillery and horses, and although the infantry were mostly armed with old-fashioned flintlocks, no such formidable force had ever assembled in South America. The news of Lopez's preparations exasperated and somewhat alarmed the people of Buenos Aires, though no one knew his exact intentions. Lopez had, in fact, determined to compel the Brazilian and Argentine governments to accept his wishes as to Uruguay or to risk all in the hazard of war. Perhaps hazy dreams of himself as emperor of a domain extending from the southern sources of the Amazon far down the Plate valley and over to the Atlantic coast passed through his brain. Possibly he foresaw clearly that Paraguay had come to the parting of the ways, and that she must either fight her way to the sea or reconcile herself to slow suffocation between the immense masses of Brazil and Argentina. In such a contest the only allies he could hope for would be revolutionary factions in Uruguay and Corrientes, and possibly the virtually independent ruler of Entre Rios. In case of a war with Brazil alone, the neutrality of Argentina might have been secured by careful management, but in the freer countries the feeling against him as a despot was strong, and the extension of his system would have been regarded as a menace to civilisation.