Precursors for military science fiction can be found in "future war" stories dating back at least to George Chesney's story "The Battle of Dorking" (1871). Other works of fiction followed, including H.G. Wells's "The Land Ironclads". Eventually, as science fiction became an established and separate genre, military science fiction established itself as a subgenre. One such work is H. Beam Piper's "Uller Uprising" (1952) (based on the events of the Sepoy Mutiny). Robert A. Heinlein's "Starship Troopers" (1959) is another work of military SF, along with Gordon Dickson's "Dorsai" (1960), and these are thought to be mostly responsible for popularizing this subgenre's popularity among young readers of the time.