The Argentine Republic being pressed by enemies, Ouribes descended towards Montevideo, and established his camp at Bajada, the capital of the province of Entre-Rios, having under his command an imposing army, and meditating with Rosas, the invasion of the State of Montevideo. Rivera was then on the left bank of the Uruguay, preparing and receiving all the forces which he could dispose of, and doubtless expecting to be attacked. Wise would have been the resolution to await the enemy in his own positions; but, having much confidence in himself, and strengthened by the junction with the army of Corrientes, he made arrangements to cross the river, and seek the enemy. The Oriental and Corrientes armies amounted to ten thousand men. Ouribes had fourteen thousand, and was much superior in infantry and artillery. The battle was short; and the combined armies were entirely defeated on the Arroyo Grande. Ouribes passed the Uruguay, invaded the territory of Montevideo, and then laid siege to the capital. The catastrophe of Arroyo Grande, and the certainty that the implacable ex-president would come, meditating terrible revenge, stimulated the population of the State of Montevideo to take up arms _en masse_ and repel the invasion by force. It should here be observed, that the war had changed its character, and it was no longer a personal consideration in favor of Rivera which induced the people to take up arms; but the fear of becoming subject to the depredations and excesses of a foreign and barbarous enemy, led them to fight for the independence of the country. The beginning of patriotism, which then animated the people, was the same which led them to so many heroic deeds, and to sustain the most desperate of struggles, at the cost of unheard of sacrifices. Then began the glorious contest carried on by the Montevideans, which still continues, and which will astonish the world, when its events are exactly known. General Paz, reduced to Montevideo, after the unfortunate occurrences in the Argentine State, was received with acclamation by the government and people, as general of the nascent army; and to him are certainly due the beginnings of bravery and discipline by which it was distinguished, as well as the system of defence which was adopted. Rivera kept the field, made skilful movements, and was defeated by Ouribes at India Muerta. The errors of Rivera and his conflicts completed his discredit, and entirely removed him from the scene of events. He is now an emigrant in Rio Janeiro, and I do not think his influence can produce any disturbance on the Rio de la Plata. The question of Montevideo, therefore, reduces itself to the following, at the present epoch (1850):