Carl Nielsen is born on 13 July 1912 in the parish of Rønninge on the island of Funen. He is the son of farmer and miller Peter Thorvald Nielsen and Hansine Marie Nielsen (née Pedersen).
Carl Nielsen volunteers for the Royal Norwegian Air Force in camp "Little Norway" during the Second World War. Initially with the intention of being trained as pilot, but he fails to be accepted for pilot training. He ends up in the camp's military police.
(Ancker, 2001; Rønhof, 1996; Parish records)