Causes of World War I corrective." British Diplomat Arthur Nicolson wrote in May 1914, “Since I have been at the Foreign Office I have not seen such calm waters.” On 28 June 1914, Archduke Franz Ferdinand of Austria, heir presumptive to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, were shot dead, by two gun shots in Sarajevo by Gavrilo Princip, one of a group of six assassins (five Serbs and one Bosniak) coordinated by Danilo Ilić, a Bosnian Serb and a member of the Black Hand secret society. The assassination is significant because it was perceived by Austria-Hungary as an existential challenge
.380 ACP 42; all three being designed to be lighter than blowback operated .380 ACP weapons. There have also been some relatively diminutive (blowback-operated) submachine guns, such as the Ingram MAC-11 and the Czech vz. 83. The .380 ACP has experienced very widespread use in the years since its introduction (1908 United States, 1912 Europe). In 1914, it was used by Gavrilo Princip to assassinate Archduke Franz Ferdinand and his wife Sophia, the event which is credited with starting World War I. It was later adopted by the armies of at least five European nations as their standard pistol cartridge before World