The Battle of Concón was fought between the forces of the Congress of Chile and loyalists of President Jose Manuel Balmaceda.

The expedition by sea was admirably managed, and on August 10 the congressist army was disembarked at Quintero, about 20 km.

north of Valparaiso, miles out of range of its defensive batteries, and marched to Concón, where the Balmacedists were entrenched.

[2] The eager infantry of the Congressional army forced the passage of the river and stormed the heights held by the Gobiernistas.

A severe fight ensued, in which the troops of President Balmaceda were defeated with heavy loss.