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Weapons improved rapidly after the Civil War, raising difficult questions about the battle tactics employed by the United States Army. The most fundamental problem was the dominance of the tactical defensive, when defenders protected by fieldworks could deliver deadly fire from rifles and artillery against attackers advancing in close-ordered lines.

Alfred Thayer Mahan is arguably the most influential military strategist in American history, and one of the world’s most important naval theorists. After a lengthy naval career, Mahan had assignments at the Naval Academy and the Brooklyn Naval Yard. He was invited to lecture at the Naval War College, and it was there that he collected together his notes and wrote a book, The Influence of Naval Power upon History, which somehow became an international best seller in 1890. Mahan went on to write twenty books and hundreds of essays and articles, most related to naval affairs.