المسيرة الخضراء
Despite a brief return to the top division which lasted only one season, the club continued to decline and in 1947 the worst fears were reached when they were relegated to Tercera División. Many fans see the ten years they spent in the category as key to the "identity" and "soul" of the club. During this time, Betis earned a reputation for filling its stadium and having a massive support at away matches, known as the "Green March".