Adam Badeau (December 29, 1831 - March 19, 1895) was an author, Union Army officer, and diplomat.Adam Badeau was born in New York City on December 29, 1831. He was raised and educated in Tarrytown and North Tarrytown (now Sleepy Hollow), and became a clerk in New York City's Street Department. He also studied law, and attained admission to the bar in 1855. In addition, Badeau was a writer, and his work as an essayist and theater critic was published in Noah's Sunday TimesBadeau joined the Union Army for the American Civil War. As a member of the staff of Thomas W. Sherman, he took part in the Siege of Corinth, Mississippi, the defense of New Orleans and the attack on Port Hudson, Louisiana.He was wounded at Port Hudson, and after his recovery, in 1864 he joined the staff of Ulysses S. Grant as a brevet Lieutenant Colonel. Badeau took part in the Wilderness and Appomattox campaigns and received promotion to brevet Colonel