"Baltimore is to be the battlefield of the southern revolution" : the Baltimore riot and the formation of Lincoln's habeas corpus policy -- "A collision of civil and military authority" : the arrest and incarceration of John Merryman -- "Prosecute your best cases not the weak and doubtful" : the difficulty of punishing disloyalty in the loyal states -- "Necessity is the tyrant's plea" : the Habeas Corpus Act, part I : congressional reaction to military arrests and tribunals -- "The government must in some way sustain you in your official acts" : the Habeas Corpus Act, part II : the failure of Congress to protect those waging war -- Epilogue : "Habeas Corpus John".