Was an Engineer as stated on his marriage certificate. Worked for Natal Railways - lost his right arm in a shunting accident. His parents in France wanted him to become a lawyer and join the family profession, he ran away and went to live in Mauritius with his uncle Louis Anicet Pierrus, (who later became his father-in-law due to Fernand marrying Louis daughter, Gabrielle Pierrus).
"South Africa, Natal Province, Civil Marriages, 1845-1955," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KDC5-NGR : 10 March 2018), Fernand Arnal and Marie Gabrielle Pierrus, 06 Feb 1907; citing Illovu River, Umlazi, Natal, South Africa; 02689; National Archives and Records Service of South Africa, Pretoria; 1,795,569.
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