May 12, 1861
- Benjamin Butler takes control of Federal Hill and threatens to fire on downtown Baltimore if Southern sympathizers protest. (During night of May 12/13)
A Chronological History of the Civil War in America1
- Renewed attempts of the rebels to destroy bridges on the railroads leading to Baltimore.
- A Chronological History of the Civil War in America by Richard Swainson Fisher, New York, Johnson and Ward, 1863