Following this period, Prohibition in the United States, an economic war with Britain in the 1930s, and World War II all harmed the industry. Tullamore was one of many Irish distilleries affected by a general decline in Irish whiskey sales worldwide. After World War II, Desmond Williams, grandson of Daniel E. Williams, used modern marketing techniques to re-establish Irish whiskey in world markets. In 1947, Desmond Williams also developed Irish Mist, an Irish liqueur made from a blend of whiskey, herbs and honey, using a recipe alleged to have disappeared in the late 17th century and to have been rediscovered in a manuscript 250 years later. Williams also capitalised on the Irish coffee concept, and promoted blended whiskies along with Tullamore Dew.