Steamboat Willie : 1st Animated Film ?

Steamboat Willie (1928) starring Mickey Mouse as innovative as it may have been, was not indeed the first Animated film. According to wikipedia , the first animated film was "El Apóstol"

"(The Apostle) is a 1917 Argentine animated cartoon. It was written and directed by Quirino Cristiani, and consisted of a total of 58,000 frames played over the course of 70 minutes (which would have meant 14 FPS). The film was a satire, with President Hipólito Yrigoyen ascending to the heavens to use Jupiter's thunderbolts to cleanse Buenos Aires of immorality and corruption. The result is a burnt city. The film is believed to have been well-received by audiences at the time. Despite this, no known copies of the film exist."
-Wikipedia : http://en.wikipedia.org/wiki/Quirino_Cristiani