This book presents an extensive collection of British diplomatic documents covering the critical period from June 28 to August 4, 1914, encompassing the events leading up to the outbreak of World War I. It offers a comprehensive and detailed account of the diplomatic interactions, negotiations, and communications between Great Britain and other European powers during this tumultuous time. The documents provide valuable insights into the complex web of alliances, rivalries, and misunderstandings that contributed to the escalating tensions and ultimately, the outbreak of war. The assassination of Archduke Franz Ferdinand of Austria in Sarajevo served as a catalyst, igniting a chain reaction of diplomatic maneuvers and military mobilizations. The author meticulously presents the efforts of Sir Edward Grey, the British Foreign Secretary, and other key figures to avert the impending conflict through mediation and diplomatic channels. However, the documents also reveal the deep-seated mistrust and miscalculations that hampered these efforts, as well as the conflicting interests and agendas of the various powers involved. By shedding light on the diplomatic failures and the complex interplay of factors that led to the outbreak of World War I, this book offers invaluable insights into one of the most pivotal moments in modern European history.