Rubuta ci gaba ga wannan sakin layi - An kama shi a lokacin yakin Filipino-American
a watan Yuli na shekara ta 1900. Bayan da aka sake shi, ya shiga Jam'iyyar Tarayya kuma an nada shi a matsayin mai kula da lardin Albay a ranar 13 ga Mayu 1901 (har zuwa 1905). A cikin 1904, ya kasance wani ɓangare na kwamitin girmamawa na kwamishinonin Filipinos waɗanda suka halarci baje kolin Siyarwa na Louisiana a ƙarƙashin Dokta Trinidad Pardo de Tavera. Calleja ya sami lambar yabo ta zinare a lokacin baje kolin da aka ambata.