the Peninsular War started in Spain, in defiance of Liniers. Elío disestablished the Junta when Liniers was replaced by Baltasar Hidalgo de Cisneros. During the May Revolution of 1810 and the subsequent uprising of the provinces of Rio de la Plata, the Spanish colonial government moved to Montevideo. During that year and the next, Uruguayan revolutionary José Gervasio Artigas united with others from Buenos Aires against Spain. In 1811, the forces deployed by the Junta Grande of Buenos Aires and the gaucho forces led by Artigas started a siege of Montevideo, which had refused to obey the directives of the new authorities of the May Revolution. The siege was lifted at the end of that year, when the military situation started deteriorating in the Upper Peru region. The Spanish governor was expelled in 1814. In 1816, Portugal invaded the recently liberated territory and in 1821, it was annexed to the Banda Oriental of Brazil. It was named Imperial City by Emperor Pedro I when the city was part of the Empire of Brazil as capital of the Cisplatina province. Juan Antonio Lavalleja and his band called the Treinta y Tres Orientales ("Thirty-Three Orientals") re-established the independence of the region in 1825. Uruguay was consolidated as an independent state in 1828, with Montevideo as the nation's capital. In 1829, the demolition of the city's fortifications began and plans were made for an extension beyond the Ciudad Vieja, referred to as the "Ciudad Nueva" ("new city"). Urban expansion, however, moved very slowly because of the events that followed. Uruguay's 1830s were dominated by the confrontation between Manuel Oribe and Fructuoso Rivera, the two revolutionary leaders who had fought against the Empire of Brazil under the command of Lavalleja, each of whom had become the caudillo of their respective faction. Politics were divided between Oribe's Blancos ("whites"), represented by the National Party, and Rivera's Colorados ("reds"), represented by the Colorado Party, with each party's name taken from the color of its emblems. In 1838, Oribe was forced to resign the presidency; he established a rebel army and began a long civil war, the Guerra Grande, which lasted until 1851. The city of Montevideo suffered a siege of eight years between 1843 and 1851, during which it was supplied by sea with British and French support. By 1843 Montevedio's population of thirty thousand inhabitants was highly cosmopolitan with Uruguayans making up only a third