 Moulin was appointed "sous-préfet" of Châteaulin, Brittany in 1930, but he also drew political cartoons for the newspaper "Le Rire" under the pseudonym "Romanin".He also illustrated books by the Breton poet Tristan Corbière, including an etching for "La Pastorale de Conlie", Corbière's poem about Camp Conlie where many Boon soldiers died in 1870 during the Franco-Prussian War.He also made friends with the Breton poets Saint-Pol-Roux in Camaret and Max Jacob in Quimper.