On the night of October 7 he was informed that the "Huáscar" had been seen near the port of Huasco and was moving north. A trap was then set. The Chilean fleet was divided into two groups. The first division was in charge of Commander Galvarino Riveros and made up of the "Blanco Encalada", "Covadonga" and the collier "Matías Cousiño". The first division would try to push Admiral Grau toward the second division that would be waiting further north. In the early hours of October 8 the plan went into effect. When the "Huáscar" and the "Unión" saw the Chilean ships blocking their way south they decided to turn back north. A few hours later they met the "Cochrane" which was waiting according to plan. Admiral Grau was forced to fight in the Battle of Angamos while the "Unión" got away.