war against the Paraguayan leader Francisco Solano López. The resulting Paraguayan War ended with the invasion of Paraguay and its defeat by the armies of the three countries. Montevideo, which was used as a supply station by the Brazilian navy, experienced a period of prosperity and relative calm during this war. The Uruguayan War, 1864–65 The Uruguayan War was fought between the governing Blancos and an alliance of the Empire of Brazil with the Colorados who were supported by Argentina. In 1863, the Colorado leader Venancio Flores launched the Liberating Crusade aimed at toppling President Bernardo Berro and his Colorado–Blanco coalition (Fusionist) government. Flores was aided by Argentina's President Bartolomé Mitre. The Fusionist coalition collapsed as Colorados joined Flores's ranks. The Uruguayan civil war developed into a crisis of international scope that destabilized the entire region. Even before the Colorado rebellion, the Blancos had sought an alliance with Paraguayan dictator Francisco Solano López. Berro's now purely Blanco government also received support from Argentine Federalists, who opposed Mitre and his Unitarians. The situation deteriorated as the Empire of Brazil was drawn into the conflict. Brazil decided to intervene to reestablish the security of its southern frontiers and its influence over regional affairs. In a combined offensive against Blanco strongholds, the Brazilian–Colorado troops advanced through Uruguayan territory, eventually surrounding Montevideo. Faced with certain defeat, the Blanco government capitulated on 20 February 1865. The short-lived war would have been regarded as an outstanding success for Brazilian and Argentine interests, had Paraguayan intervention in support of the Blancos (with attacks upon Brazilian and Argentine provinces) not led to the long and costly Paraguayan War. In February 1868, former Presidents Bernardo Berro and Venancio Flores were assassinated. Social and economic developments up to 1900 Colorado rule The Colorados ruled without interruption from 1865 until 1958 despite internal conflicts, conflicts with neighboring states, political and economic fluctuations, and a wave of mass immigration from Europe. 1872 power-sharing agreement The government of General Lorenzo Batlle y Grau suppressed the Revolution of the Lances, which started in September 1870 under the leadership of Blanco Timoteo Aparicio. After two years of struggle, a peace agreement was signed on 6 April 1872 when a power-sharing agreement was signed giving the Blancos control over four out of the thirteen departments of Uruguay—Canelones, San Jose, Florida, and Cerro Largo—and a guaranteed, if limited representation in Parliament. This establishment of the policy of