On August 1, 1912, the couple founded the family company Maison Langlois-Chateau at St-Hilaire-St-Florent, with the help of Baron de Bodman, owner of Château de St-Florent and the adjoining vineyard; the Baron would thus bring cellars, land, and buildings to the young firm which, also, bought the business of the former Maison Delandes, founded in 1885.
Langlois-Chateau specialized immediately in the production of “sparkling wines”. Business started off weell, but was interrupted by World War I during which Edouard Langlois was killed on March 31, 1915. He was 42 years old and had been awarded the Croix de Guerre (Military Cross).