Arhul Nemo served as a lieutenant for the Commenor Underground while the Galactic Empire was in power during the reign. Circa 10 BBY, he encountered Saw Gerrera, a freedom fighter, together with his partisans, which included Jyn Erso, who was twelve-year-old. Gerrera informed Nemo that he had saved Erso—who was the group member Nemo liked best—and brought her up as if she were his own daughter. Nemo subsequently communicated this meeting to the intelligence agency that belonged to the Alliance to Restore the Republic. This communication was part of a dossier from 1 BBY containing data given by General Airen Cracken to Chief of State Mon Mothma regarding Operation Fracture, a critical mission where Erso played an essential role.