After taking office, López opted to continue most of the policies of
economic protectionism and internal development adopted by his predecessors. However, he broke sharply with the traditional policy of strict
isolationism in foreign affairs that was favoured by previous Paraguayan leaders. López instead embarked on a more activist approach to international policy. He had, as his great ambition, to position Paraguay as a credible "third force" in the ongoing rivalry between Argentina and the
Empire of Brazil over control of the
Rio de la Plata Basin. López wanted Paraguay to compete with the continent's major powers in the struggle for spoils and regional dominance. In pursuit of this goal, López sought to organize the region's smaller nations into a political coalition designed to offset the power and influence of the Brazilians and the Argentines. López found an eager ally in Uruguayan President
Bernardo Berro, another leader whose country was frequently menaced by the various intrigues of the continent's two great powers. Berro and López quickly concluded an alliance, and López began a massive expansion and reorganization of the Paraguayan military, introducing mandatory military service for all men along with other reforms. Under López, Paraguay grew to possess one of the best-trained but ill-equipped military in the region. He bought new weapons from France and England but they failed to arrive because of the blockade imposed by the allies when the war broke out.
Role in beginning the war In 1863, the
Empire of Brazil—which did not have friendly relations with Paraguay—began providing military and political support to an incipient rebellion in Uruguay led by
Venancio Flores and his
Colorado Party against the
Blanco Party government of
Bernardo Berro and his successor,
Atanasio Aguirre. The besieged Uruguayans repeatedly asked for military assistance from their Paraguayan allies against the Brazilian-backed rebels. López manifested his support for Aguirre's government via a letter to Brazil, in which he said that any occupation of Uruguayan lands by Brazil would be considered an attack on Paraguay. When Brazil did not heed the letter and invaded Uruguay on 12 October 1864, López seized the Brazilian merchant steamer
Marqués de Olinda in the harbour of Asunción, and imprisoned the Brazilian governor of the province of
Mato Grosso, who was on board. In the following month (December 1864) López formally declared war on Brazil and dispatched a force to invade Mato Grosso. The force seized and sacked the town of
Corumbá and took possession of the province and its diamond mines, together with an immense quantity of arms and ammunition, including enough gunpowder to last the whole Paraguayan Army for at least a year of active war. However, Paraguayan forces could not or would not seize the capital city of
Cuiabá, in northern Mato Grosso. López next intended to send troops to Uruguay to support the government of
Atanasio Aguirre, yet when he requested permission from Argentina to cross onto its soil, President
Bartolomé Mitre refused to allow the Paraguayan force to cross the intervening
province of Corrientes. By this time the Brazilians had managed to successfully topple Aguirre and install their ally Venancio Flores as president, rendering Uruguay little more than a Brazilian puppet state.
War of the Triple Alliance The war which ensued, lasting until 1 March 1870, was carried on with great stubbornness and with alternating fortunes, though López's disasters steadily increased. His first major setback came on 11 June 1865, when the powerless
Paraguayan fleet was destroyed by the
Brazilian Navy at the
Battle of Riachuelo, which gave the Allies control over the various waterways surrounding Paraguay and forced López to withdraw from Argentina. On 12 September 1866, López invited Mitre to a
conference in Yataytí Corá. López believed that the time was right to treat for peace and was ready to sign a peace treaty with the Allies. No agreement was reached though since Mitre's conditions were that every article of the
Treaty of the Triple Alliance was still to be carried out, a condition which López refused. Regardless of López's refusal, a peace treaty was not something Mitre could guarantee except on the terms of article VI of the treaty which stated that "The allies pledge themselves solemnly not to lay down their arms unless by common accord, nor until they have overthrown the present Government of Paraguay, nor to treat with the enemy separately, nor sign any Treaty of peace, truce, armistice, or Convention whatsoever for putting an end or suspending the war, unless by a perfect agreement of all". In 1868, when the allies were pressing him hard, he convinced himself that his Paraguayan supporters had actually formed a conspiracy against his life. Thereupon, several hundred prominent Paraguayan citizens were seized and executed by his order, including his brothers and brothers-in-law, cabinet ministers, judges, prefects, military officers, bishops and priests, and nine-tenths of the civil officers, together with more than two hundred foreigners, among them several members of the diplomatic legations (the
San Fernando massacre). During this time, he also had his 70-year-old mother flogged and ordered her execution because she revealed to him that he had been born out of wedlock.
Ramona Martínez, who worked as a nurse in the war, had been enslaved by López; for her fighting and rallying of soldiers, she was nicknamed "the American Joan of Arc".
Battle of Cerro Corá Allied troops captured the Paraguayan capital city of Asunción on 1 January 1869, forcing López and what remained of his army and government to flee to the countryside. By late 1869, López was at last driven with a handful of troops to the northern frontier of Paraguay. He arrived at
Cerro Corá on 14 February 1870. Two detachments were sent in pursuit of Solano López, who was accompanied by 200 men in the forests in the north, where he received news of the considerable Brazilian forces that were closing in on him. This caused some of the officials who were still with López to abandon him and approach the allied force, under the command of the Brazilian General
José Antônio Correia da Câmara, which they readily joined as scouts in order to lead them to López. Upon hearing about this, López called a last
war council with the remaining officers of his general staff in order to decide the course of action for the upcoming battle: whether they should escape into the rainforest hill range or stay and make a stand against the attackers. The council decided to stay and end the war once and for all by fighting to the death. The Brazilian force reached the camp on 1 March. During the battle that ensued, López was separated from the remainder of his army and was accompanied by only his aide and a couple of officers. He had been wounded with a spear in the stomach and hit with a sword in the side of his head and so was too weak to walk by himself. They led him to the Aquidabangui stream, and there they left him on the pretext of getting reinforcements. While López was alone with his aide, General Câmara arrived along with six soldiers and approached him, calling on him to surrender and guaranteeing his life. López refused and shouting
¡Muero con mi patria!, ("I die with my nation!"), tried to attack Câmara with his sword. Câmara ordered him to be disarmed, but López died during the struggle with the soldiers who were trying to disarm him. This incident marked the end of the war of the Triple Alliance. == Legacy ==