Rubuta ci gaba ga wannan sakin layi - Bayan ya warke daga raunin da ya ji, ya koma arewa don shiga cikin yakin. Otto ya shiga cikin jirgin ruwa mai suna "Amazonas" a matsayin kwamandan rundunar soja a kan jirgin. A watan Oktoba, a lokacin yakin basasa, yana da amfani na kasancewa daya daga cikin mahalarta shari'a a cikin farashin da aka kama na Peruvian ironclad "Húascar". Daga baya aka mayar da Otto zuwa Rundunar 'Yan Bindigar Marine tare da mukamin Laftanar. Ya shiga cikin yakin Pisagua
da Yakin Tarapacá, duka a watan Nuwamba, yayin Yaƙin Tarapacá, da Yaƙin Tacna a watan Mayu 1880, yayin Yaƙin Tacna <unk> Arica. A lokacin na karshen, rundunarsa ta kasance daya daga cikin rukunin sojoji da suka yanke hukuncin cin nasarar Chile a tsakiyar layin yaƙi.