1947 saw Lord Kitchener and Killer forming the renegade calypso tent Young Brigade. The term "Young Brigade" soon came to refer to a specific group of calypsonians that used fictional narratives and humor with new, more dance-able rhythms. Kitchener was by far the most popular of the Young Brigade calypsonians, and he helped popularize calypso in the United Kingdom and elsewhere. Mighty Sparrow's first hit was "Jean and Dinah", celebrating the departure of American military forces from Trinidad; the song launched a new generation of politically active calypso music, which soon became associated with the People's National Movement. Roaring Lion was also a major part of this vanguard in calypso music, and he became known for a traditionalist style that he maintained throughout his career.