...ksburg has cast a shadow over the army. We did hope that Burnside would be successful, and thus brighten the prospect for a speedy peace; but we are in deeper gloom now than ever. The repulse at Fredericksburg , while it has disabled thousands, has disheartened, if not demoralized a great army, and given confidence and strength to the rebels every-where. It may be, however, that this defeat was necessary ...