The dominos were lined up, and on this fateful day, the first one fell. Archduke Franz Ferdinand's assassination in June had ignited a firestorm of diplomatic tensions, and now Austria-Hungary was fed up with Serbia's perceived insolence. In a move that would shake the world, Austria-Hungary declared war on Serbia, unwittingly unleashing a global conflict that would claim millions of lives and redraw the map of Europe. The complex web of alliances was about to ensnare the continent, and the world would never be the same.