The slogan, “A lion sleeps in the heart of every brave man,” displayed beneath the title of the World War II documentary “Valiant,” embodies the intended point of the film: the mettle of American fighting men rising to the challenge. “Valiant” was produced, directed and edited by a remarkably talented 22 year old named Rachel Horstmann. Just one of many devoted and gifted people working at Triple Horse Studios in Covington, Horstmann’s childhood dream envisioned a career in filmmaking.