Winner of the 2019 RUSI Duke of Wellington Medal for Military HistoryWinner of the 2017 Society for Army Historical Research Templer MedalShortlisted for Military History Monthly's "Book of the Year" AwardThe first of two groundbreaking volumes on the Waterloo campaign, this book is based upon a detailed analysis of sources old and new in four languages. It highlights the political stresses between the Allies, and their resolution; it studies the problems of feeding and paying for 250,000 Allied forces assembling in Belgium during the ‘undeclared war’, and how a strategy was thrashed out. It studies the neglected topic of how the slow and discordant Allies beyond the Rhine hampered the plans of Blücher and Wellington, thus allowing Napoleon to snatch the initiative from them. Napoleon’s operational plan is analyzed (and Soult's mistakes in executing it). Accounts from both sides help provide a vivid impression of the fighting on the first day, 15 June, and the volume ends with the joint battles of Ligny and Quatre Bras the next day.