Answer :
The initial military action that triggered World War I (WWI) occurred on July 28, 1914, when Austria-Hungary declared war on Serbia. This declaration followed the assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, by Gavrilo Princip, a Serbian nationalist, on June 28, 1914. Austria-Hungary issued an ultimatum to Serbia with harsh terms, which Serbia mostly accepted but did not fully comply with.
On August 1, 1914, Germany, allied with Austria-Hungary through the Triple Alliance, declared war on Russia, which was supporting Serbia. As a result, Germany also declared war on France, Russia's ally, on August 3, 1914. The German army then invaded neutral Belgium on August 4, 1914, to bypass the heavily fortified French border. This prompted Britain, allied with France and Russia through the Triple Entente, to declare war on Germany.
These chain reactions of alliances and declarations of war led to a widespread conflict, marking the beginning of World War I. The military actions were characterized by trench warfare, large-scale battles, and the use of new technologies like machine guns, poison gas, and advanced artillery. The war lasted until November 11, 1918, when the armistice was signed, ultimately leading to significant political, social, and economic changes across the globe.
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