Today, 185 years ago, on September 27, 1840 (Calendar 2 September 1840), American naval strategist Mahan was born. The U.S. Navy strategist Alfred Mahan was born on September 27, 1840, the U.S. Navy strategist Alfred-Mahan was born in the western town of New York. In 1859, he graduated from the U.S. Navy Academy. Served in the Navy during the Northern War, served as captain. In 1886, he was appointed director of the U.S. Navy Operations Academy. In 1890, he published his special book, The Impact of Naval Rule on History, 1660-1783 (1890). In 1892, he also published two volumes of his book, The Impact of Naval Rule on the French Revolution and Empire of 1793-1812. In his book, Mahan summarized