In June 1862, Davis was forced to assign General Robert E. Lee to replace the wounded Joseph E. Johnston to command of the Army of Northern Virginia, the main Confederate army in the Eastern Theater. That December Davis made a tour of Confederate armies in the west of the country. He had a very small circle of military advisers. He largely made the main strategic decisions on his own, though he had special respect for Lee's views. Given the Confederacy's limited resources compared with the Union, Davis decided the Confederacy would have to fight mostly on the strategic defensive. He maintained this outlook throughout the war, paying special attention to the defense of his national capital at Richmond. He approved Lee's strategic offensives when he felt that military success would both shake Northern self-confidence and strengthen the peace movements there. However, the several campaigns invading the North were met with defeat. A bloody battle at Antietam in Maryland as well as the ride into Kentucky, the Confederate Heartland Offensive (both in 1862) drained irreplaceable men and talented officers. A final offense led to the three-day bloodletting at Gettysburg in Pennsylvania (1863), crippling the South still further. The status of techniques and munitions made the defensive side much more likely to endure: an expensive lesson vindicating Davis's initial belief.