 The "Santiago" performed the flanking attack, and three companies of the other units assaulted the trenches, but had to be reinforced with another five.The Chileans broke through and took Redoubt Nº 1, and Cáceres retreated to Redoubt Nº 2.When the whole of Lynch's division gathered and when Barbosa's brigade reinforced the left flank, the Peruvian offensive weakened.