The Grand Army of the Republic, the largest of all Union Army veterans' organizations, was the most powerful single-issue political lobby of the late nineteenth century, securing massive pensions for veterans and helping to elect five postwar presidents from its own membership. To its members, it was also a secret fraternal order, a source of local charity, a provider of entertainment in small municipalities, and a patriotic organization. Using GAR convention proceedings, newspapers, songs, rule books, and local post records, Stuart McConnell examines this influential veterans' association...