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
History of the Royal Marines the professional differences between RN and RM officers through a system of common entry that provided for an initial period of service where both groups performed the same roles and underwent the same training. For the first part of the 20th century, the Royal Marines' role was the traditional one of providing shipboard infantry for security, boarding parties and small-scale landings. The Marines' other traditional position on a Royal Navy ship was manning 'X' and 'Y' (the aftermost) gun turrets on a battleship or cruiser. During the First World War, in addition to their usual stations aboard ship, Royal Marines