Eagles on Their Buttons is a fascinating examination of the Fifth Regiment of Infantry, United States Colored Troops--the Union Army's first black regiment from Ohio. Although the Fifth USCT was one of more than 150 regiments of black troops making up more than 10 percent of the Union Army at the end of the war, it was unique. The majority of USCT regiments were made up of freed men who viewed the army as an escape from slavery and a chance to take...