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
German frigate Rheinland-Pfalz (F209) was intercepted by the German frigate and seized by German marines, who captured nine suspects. The German boarding party found a cache of one rocket launcher, three AK-47 rifles, a Tokarev pistol, a carbine and an automatic rifle. This was the first time that the German Navy seized a hostile vessel and her crew at sea since the Second World War. Early in the morning of 30 March 2009, a group of Somali pirates approached the German naval replenishment tanker "Spessart", opened fire upon her and attempted to board the vessel. The attack was averted by the on-board security detachment,