In the years 1905 to 1907 he attended the Norwegian Military College, but left the school three months before graduation, citing personal reasons.

[4] Initially serving as a first lieutenant, he advanced to the rank of Commandant before he was ordered by the Norwegian authorities to leave Belgian service in 1915.

[1] No longer supernumerary, due to the Norwegian Army needing more officers during the First World War, Røhn was instructed to resume his regular duties with the 5th Brigade from 1 July 1915.

[11] As a captain in the reserve forces, he applied unsuccessfully for the rank of lieutenant colonel, and the command of the landvern battalion of the 12th Infantry Regiment, in 1933.

[13] The final application he handed in was rejected by the Norwegian authorities in 1939, when he applied for a promotion to lieutenant colonel and the command of either the 11th or the 12th Infantry Regiments' landvern battalion.

The team won the first ever gold medal for Norway in an Olympic competition,[7][15] having trained together for one month before travelling to Greece.

The silver cup, a gift from King George I of Greece, was, after arrival in Norway, inscribed at the base with the names of the gymnasts from the 1906 team.

He had invested in a stake in the 4.32 square kilometres (1.67 sq mi) "La Liza" plantation, near the city of Baracoa, which had been previously purchased by other Norwegians.

In addition to the crops, the Norwegians planned to cut timber and raise swine for sale at the local markets.

[21][Note 1] In the legal purge after the end of the Second World War, Røhn was convicted of treason against Norway and sentenced to four years in prison with forced labour.