What happened on aug 1st 1914?

On August 1, 1914, Germany declared war on Russia, marking a significant escalation in tensions that had been building in Europe. This declaration came just days after Austria-Hungary declared war on Serbia, following the assassination of Archduke Franz Ferdinand. The event set off a chain reaction of alliances and declarations of war that ultimately led to the outbreak of World War I. This conflict would last until 1918 and involve many of the world's great powers.