Pérez worked as secretary of the expedition, replacing Manuel Ancízar, who had fallen ill along the trip, his mission was to record events, places, descriptions, statistics, and other valuable information of the places they went to.
Pérez worked. Secretary of the expedition was replacing Manuel Ancízar. The expedition was his mission. Secretary of the expedition was to record events, places, descriptions, statistics, and other valuable information of the places they went to. The expedition was his mission. Manuel Ancízar had fallen ill along the trip.