Baltasar Hidalgo de Cisneros
The news of the fall of the Junta of Seville reached Buenos Aires in May 1810. With both the king of Spain and the Junta removed of power, many people thought that Cisneros had no legitimacy to govern, starting the May Revolution. Cisneros tried to calm down the population, to no avail. He called the commanders of the local armies and requested their support, but they denied it. Cisneros was ultimately forced to allow an open cabildo, which would discuss what to do. Although those meetings were usually composed of the wealthiest population, the army and a group of rioters plotted to prevent the entry of many wealthy people and allow common people instead.
Montevideo
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.