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
Imperial German plans for the invasion of the United Kingdom for success, requiring the use of port facilities seized in Belgium and the Netherlands to embark the expeditionary force. Reconnaissance of the English east coast was completed and potential landing sites in East Anglia were selected. Comments were invited from Alfred von Schlieffen, Chief of the German General Staff, who regarded an invasion to be impractical. His staff estimated that it would require up to 320,000 troops to defeat the British home defences and capture London, and that a quick victory would be necessary if the expeditionary force was not to be cut off and forced to surrender. The plans