Countless books have examined the battle of Gettysburg, but the retreat of the armies to the Potomac River and beyond has not been as thoroughly covered. “Lee is Trapped, and Must be Taken”: Eleven Fateful Days after Gettysburg: July 4 to July 14, 1863, by Thomas J. Ryan and Richard R. Schaus goes a long way toward rectifying this oversight. This comprehensive study focuses on the immediate aftermath of the battle and addresses how Maj. Gen. George G. Meade organized and motivated his Army of the Potomac in response to President Abraham Lincoln’s mandate to bring about the “literal or substantial destruction” of Gen. Robert E. Lee’s retreating Army of Northern Virginia. As far as the president was concerned, if Meade aggressively pursued and confronted Lee before he could escape across the flooded Potomac River, “the rebellion would be over.”