On May 1, 1865, two weeks after Abraham Lincoln's assassination, recently inaugurated president Andrew Johnson appointed John Frederick Hartranft to command the military prison at the Washington Arsenal, where the U.S. government had just incarcerated the seven men and one woman accused of complicity in the shooting. From that day through the execution of four of the accomplices, the Pennsylvania-born general held responsibility for the most notorious prisoners in American history. A strict adherent to protocol, Hartranft kept a meticulously detailed account of his experiences in the form of a