Original sentence: When the War of the Pacific began in 1879 between Chile and the alliance between Peru and Bolivia, Bolognesi, now 62, rejoined the Peruvian Army and was active in actions against the Chilean forces, including the Battles of Dolores and Tarapacá in November, 1879
Edited sentence: When the War of the Pacific began in 1879 (Chile attacking Peru and Bolivia), Bolognesi, now 62, rejoined the Peruvian Army and was active in actions against the Chilean forces, including the Battles of Dolores and Tarapacá in November, 1879