AUGUST 24TH.—We are resting on our oars after the victory at Manassas, while the enemy is drilling and equipping 500,000 or 600,000 men. I hope we may not soon be floating down stream! We know the enemy is, besides, building iron-clad steamers—and yet we are not even erecting casemate batteries! We are losing precious time, and, perhaps, the government is saving money.