General George Meade appointed commander of the Army of the Potomac, replacing Joseph Hooker
With the single sentence of War Department General Order 194, "by direction of the President," Major General George Meade was appointed as commander of the Army of the Potomac, replacing Major General Joseph Hooker, whose precipitous offer to resign had been swiftly accepted. Meade's first duty was the interception of Robert E. Lee's Army of Northern Virginia, then bearing down on Meade's home state of Pennsylvania. (By John Osborne)
"General Order No. 194," War Department, Thomas M. O"Brien, Oliver Diefendorf (eds), General Orders of the War Department, Embracing the years 1861, 1862, 1863 ... (New York: Derby and Miller, 1864), II: 219.