Lines for French mobilization at Gare de Lyon train station in Paris. The official order was given at 4 pm on Saturday, August 1st, beginning the initial call-up of a million men for the French Army (source: historyplace.com).
Image source:Bain News Service, Publisher. Mobilizing before Gare de Lyon, Paris. , ca. 1910. [Between and Ca. 1915] Photograph. Retrieved from the Library of Congress, https://www.loc.gov/item/ggb2005017560/. (Accessed May 01, 2017.)