An Unseen Enemy

An Unseen Enemy is a 1912 Biograph Company short silent film directed by D. W. Griffith, and was the first film to be made starring the actresses Lillian Gish and Dorothy Gish. A critic of the time stated that the Gish sisters gave charming performances in this onereel film. The film was shot in Fort Lee, New Jersey where early film studios in Americas first motion picture industry were based at the beginning of the 20th century.

Source: Wikipedia