In a notable confrontation of the War of the Pacific, the Battle of La Concepción epitomized the fierce resistance faced by Chilean forces in the latter stages of the conflict. Located in the Peruvian territory, a small contingent of Chilean soldiers, numbering only 77 men, found themselves ensconced in a garrison at La Concepción. Opposing them was a vastly larger Peruvian force estimated to be approximately 1,300 strong, composed largely of local militia and indigenous troops, many of whom were armed with traditional weapons such as spears.

The battle erupted as Peruvian forces launched a surprise attack on the Chilean garrison. Despite being greatly outnumbered, the Chilean defenders put up a valiant fight, but the overwhelming odds were too great to withstand. The resistance lasted several hours, but eventual casualties mounted, and within a short span, virtually the entire garrison was annihilated. This defeat would later be noted as one of the last major military failures for Chile during the War of the Pacific.

The battle was significant not just for its immediate military implications, but also for its psychological effects on both sides. It demonstrated the capability of Peruvian forces to rally and resist despite previous defeats, while for the Chileans, it marked a turning point in the perception of their invincibility throughout the war. The engagement would have long-lasting ramifications on Chile-Peru relations and set the stage for subsequent military engagements as both nations navigated the complex aftermath of the conflict.