The document summarizes the first 12 months of World War 1. It began in July 1914 when Austria declared war on Serbia after the assassination of Archduke Franz Ferdinand. Alliances pulled more countries into the war, with Germany and Austria-Hungary allied against Russia, France and Britain. Within a month, Germany declared war on Russia, France, and invaded Belgium, drawing Britain into the war as well. The early battles established the Eastern and Western fronts as the two sides engaged in attacks and troop movements. Key terms like "No Man's Land" and the Dardanelles Strait are also defined.