President Lincoln views a tethered hot-air balloon ascent outside Washington D. C. The balloon was considered a top secret observation instrument to be used for observation during battles
Major papers in London reflect the division over the American Civil War in Britain. In an editorial, the London Post backs an independent Southern Nation. Previously, the London Times had backed the Union.
Winfield Scott informs General Robert Anderson that he is relieved of duty by telegram. He relinquishes command of the Department of Kentucky the following day.
General William Tecumseh Sherman replaces General Robert Anderson as commander of the Department of the Cumberland. Anderson had suffered a severe mental breakdown.
The Theodora leaves Charleston Harbor for Havana Cuba. On board are the Confederate States of America commissioners to England (James Mason) and France (John Slidell)
Battle of Leesburg [CS]
Battle of Ball's Bluff [US]
Battle of Harrison Island [US]
General Nathan Evans [CS] defeats General Charles Stone [US]. Oregon Senator Edward Baker, field commander, becomes the first (and only) sitting senator to die in battle.