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.