Mexican Revolution revolution was in 1914, during the "Ypiranga" incident. When United States intelligence agents received word that the "Ypiranga", a German merchant ship, contained illegal firepower for Huerta, President Wilson ordered American troops to the port of Veracruz to stop the ship from docking. Wilson never actually declared war on Mexico. The United States skirmished with Huerta's troops in Veracruz. The "Ypiranga" successfully docked at another port and unloaded the arms, which greatly angered Wilson. The ABC Powers arbitrated and U.S. troops left Mexican soil, but the incident added to already tense Mexican-American relations. In 1916, in retaliation for Pancho Villa's
The Rebel Flesh Earth in the 22nd century, which has been converted into a factory to pump acid off the island. To prevent death from the acid, the workers have utilized a "programmable matter" called the Flesh, which creates a doppelgänger (called "Ganger") controlled by the worker. As the solar storm hits, the Gangers become independent, and the Doctor, Amy and Rory must work to prevent the two groups from breaking into a war. Showrunner Steven Moffat specifically asked Graham to write the episodes about "avatars that rebel", although the Flesh and the monastery were Graham's original ideas. The episode was filmed in