sentences:  After the war, Luxembourg left the Zollverein, and ARBED had to seek out new export markets.In 1919 Émile Mayrisch founded "Terres Rouges" together with Schneider-Creusot, against the resistance of ARBED's president, the Belgian Gaston Barbanson.Mayrisch soon became president of the board, and it was he who negotiated an agreement between the German, French, Belgian and Luxembourgish steel industry.