[2] Peter Harboe Castberg enrolled as a law student in 1862, but as he was later hired as a stenographer in the Norwegian Parliament, he quit the studies.
[1][quote 1] Parallel to his business career, Castberg conducted military and economic studies on his own.
He became known for the paper Vil Ofoten-Luleåbanen blive af nogen særegen Betydning for de forenede Rigers militære Forhold?
[2] In 1902 he published Ældre og nyere Udtalelser vedrørende Sveriges faste Forsvar.
[2] The question on the presence fortresses on the Norwegian-Swedish border would become a hot topic at the dissolution of the union in 1905, specifically in the Convention of Karlstad.