For the weekly magazine Le Soir Illustré, he made at the same time a medieval comic about a knight.
Craenhals soon became one of the main producers of comics for magazines and newspapers, and a number of collaborators joined his studio.
He worked for the Averbode magazine Petits Belges, and published for many years Primus et Musette in La Libre Belgique.
He was one of the first comics artists to join Hergé at the editor Casterman, where his two main series were published: the juvenile Les 4 As about a band of four youngsters (three boys and a girl) and their over-the-top adventures; and the more adult, Prince Valiant-inspired Chevalier Ardent (The Brave Knight), about a young knight in the Middle Ages.
[1] In the 1990s, Craenhals moved to Rivières-de-Theyrargues in the south of France, where he continued drawing his two series until his death in 2004 in Montpellier.