There was a second army force by the Uruguay River under the command of Domingo French, besides Artigas's militias, who had not yet joined the siege due to disagreements with the political leader of the rebels, Manuel de Sarratea.

Knowing that fact, Spanish general Gaspar de Vigodet decided to effect a massive breakout to confront the enemy, but he had bad timing as just the night before the attack, Rondeau received reinforcements and supplies.

The royalists were dislodged from the hill and while running downhill, they were attacked by the rebel cavalry under Rafael Hortiguera, completing the rout and the enemy's retreat.

This situation lasted until 17 May 1814, with the naval victories of Admiral William Brown, which forced Vigodet to surrender to an army marginally bigger than the one Rondeau had.

Rondeau was promoted to general, and later given command of the Army of the North, and two times the post of Supreme Director of the United Provinces of the Río de la Plata.