In this work we report the results of the osteological analysis of a Peruvian officer who died in the Alto de la Alianza battle (May 26th, 1880, Tacna, Peru). The biological profile and the nature of their lesions were addressed by using standardized osteological methods. The results indicate that he was a male, between 27 and 37 years old, with a mean stature of 1.64 m (with a possible range between 1.58 and 1.72 m), with some morphoscopic craniofacial traits that suggest probable European ancestry. His lesions show that he was seriously wounded by at least two firearm projectiles, and then, executed by enemy troops with another gunshot. The results presented herein are a general example of the combat practices of the late 19th century. [ABSTRACT FROM AUTHOR]