Germany Declares War on France: WWI Escalates

Two days after declaring war on Russia, Germany followed its war plans to their logical and catastrophic conclusion by declaring war on France on August 3, 1914. The declaration was almost beside the point. German troops had already begun crossing into Luxembourg and were massing on the Belgian border, following the Schlieffen Plan's demand for a rapid knockout blow against France before Russia could fully mobilize in the east. War with France was not a response to French aggression but a strategic requirement of Germany's own military timetable. France and Germany had been locked in mutual hostility since the Franco-Prussian War of 1870-71, which had ended with German unification in the Hall of Mirrors at Versailles and the humiliating French loss of Alsace-Lorraine. The French army had spent the intervening decades preparing for a war of revenge, building fortifications along the German border and developing Plan XVII, an offensive strategy centered on a direct thrust into the lost provinces. Neither side particularly wanted to avoid the confrontation. Germany's formal justification for war included fabricated claims of French aerial bombing of Nuremberg, allegations that were entirely false and quickly disproven. The real reason needed no pretense: the alliance system and German war planning made a two-front war inevitable once mobilization began. France had been bound to Russia by treaty since 1894, and both nations understood that an attack on one meant war with the other. The following day, German troops invaded Belgium, bringing Britain into the war and transforming a European conflict into a global one. The Western Front that resulted would stretch from the Swiss border to the English Channel, consume millions of lives in four years of trench warfare, and produce casualties on a scale that permanently altered European society's relationship with war, honor, and the state.