In September 1861, James W. Wall, 42-year-old former mayor of Burlington, N.J., a lawyer and prominent member of the Democratic Party, sat under heavy guard on an island in New York Harbor. Wall wasn’t told why he was being held, but the Philadelphia Inquirer reported how he had gotten there.

The U.S. marshal “received a warrant from the Secretary of War, for the arrest of Col. J. W. Wall, of Burlington. Having procured assistance, the Marshal about half-past two o’clock proceeded to Col.