The Battle of Las Piedras (1811) was the decisive defeat of Elío by land, although he was still keeping Montevideo supported by naval forces. At this point, Elío allied himself with Brazilian forces and requested their intervention in the conflict. Fearing defeat, Buenos Aires signed a truce with Elío, recognizing him as the ruler of the Banda Oriental and half of Entre Ríos. Considering this a treacherous move, Artigas abandoned the blockade over Montevideo and moved to Entre Rios with his supporters.