 One of his most popular films, "Juurakon Hulda" (1937), was seen in cinemas by approximately a million viewers out of a population of 3.5 million.It was also remade in Hollywood as "The Farmer's Daughter".Vaala's other popular films included "Niskavuoren naiset" in 1938 and his adaptations from Mika Waltari's books "Gabriel, tule takaisin" (1951) and "Omena putoaa…" (1952).