Antoine-Henri Jomini was the most celebrated writer on the Napoleonic art of war. Jomini was present at most of the most important battles of the Napoleonic Wars. His writing therefore is the most authoritative on the subject."The art of war as generally considered consists of five purely military branches -viz.: Strategy Grand Tactics Logistics Engineering and Tactics. A sixth and essential branch hitherto unrecognized might be termed Diplomacy in its relation to War. Although this branch is more naturally and intimately connected with the profession of a statesman than with that of a soldier it cannot be denied that if it be useless to a subordinate general it is indispensable to every general commanding an army." -Antoine-Henri Jomini