Newspapers north and south rumored that the Maryland Legislature would pass an Orninance of Secession at its next sitting.  Federal troops under General N.P. Banks, led in part by Allen Pinkerton, arrested and imprisoned at Fort McHenry the considered ringleaders, including Mayor Brown of Baltimore, the editors of the Baltimore Exchange newspaper, and various legislators, among them U.S. Congressman Henry May. (By John Osborne)

Pierce Butler, from a prominent Philadelphia family, owned several South Carolina plantations.  His marriage to the famous English actress Fanny Kemble had, in fact, foundered over the issue of slavery when Fanny became a public advocate of abolition.  He left Philadelphia for the South during the Fort Sumter crisis but had returned recently to the city.  He was arrested for suspected treason and taken to Fort Hamilton, N.Y..  Released a few weeks later, he returned to Philadelphia, and remained there for the rest of the war.  (By John Osborne) 

Former presidential candidate and now Union commander in Missouri, Major General John C. Frémont, had declared martial law in the state on August 30, 1861. More contentiously, the proclamation also mandated the emancipation of all slaves held by those in rebellion. When President Lincoln later asked him to amend his order to comply with the First Confiscation Act, applying only to slaves forced into military labor, Frémont refused and Lincoln was obliged to give him direct orders to modify it.  Frémont was relieved of his command six weeks later.  (By John Osborne)  

Former presidential candidate and now Union commander in Missouri, Major General John C. Frémont, declared martial law in the state. More contentiously, the proclamation also mandated the emancipation of all slaves held by those in rebellion. When President Lincoln later asked him to amend his order to comply with the First Confiscation Act, applying only to slaves forced into military labor, Frémont refused and Lincoln was forced to give him direct orders to suspend it on September 11, 1861.  (By John Osborne)  

The newly formed New York Rifles were camped at Willett's Point in present-day Queen's, in New York City.  An entire company, Company B,  planned to desert while on guard to another regiment forming in the city.  Late in the evening, having discovered the plan, a Rifles patrol confronted the deserting men.  Shots were fired and two men from Company C were killed and five others wounded. The ringleaders were arrested. (By John Osborne)

Philadelphia newspapers announced that the city now had around ten thousand men in the field, ranged in ten regiments.  Hundreds of other Philadelphians had enlisted with regiments in New York, including Colonel Baker's California Regiment and New York's Garibaldi Regiment.  The press also noted that four more regiments were now forming in the city. (By John Osborne)

Philadelphian Thomas Young spoke in front of the Methodist Church on Green Street and questioned, according to reports, the Government's right to hang Southern privateers for piracy. He also justified the recent shooting of Colonel Ellsworth.  His enraged listeners chased him into a nearby house, where he was arrested.  Mayor Alexander Henry, though, determined Young was within his First Amendment rights and released him. (By John Osborne)