When Gen. Robert E. Lee assumed command of the Army of Northern Virginia on June 1, 1862, it was essentially an amalgamation of units, not a united force. Lee gave the army a distinctive organizational culture based on his belief that if the Confederacy were to win the war, it would have to do so quickly. This necessitated an operational strategy that emphasized seizing the initiative, even though his army always faced a numerically superior foe. Implementation of this strategy required aggressive leadership at all levels, particularly among Lee’s top subordinates. Lee secured this kind of leadership by systematically ridding himself of senior lieutenants who proved cautious in battle while forgiving mistakes, even expensive ones, on the part of subordinates who showed themselves to be offensive-minded. This “embedding mechanism,” as specialists in management science would call it, sent an unmistakable signal to the rest of the army’s leaders that they were expected to be bold in action. Lee’s aggressive strategy sought to destroy the enemy army, but his ultimate goal was to demoralize Northern public opinion, which he regarded as the Union’s center of gravity. Although he failed to accomplish this, Lee's many battlefield victories made his army the focus of Confederate nationalism, so that his surrender at Appomattox equated with the death of the Confederacy.