JUNE 3D.—The Secretary arrived to-day, sick; and was accompanied by Major Tyler, himself unwell. And troops are beginning to arrive in considerable numbers. The precincts of the city will soon be a series of encampments. The regiments are drilled here, and these mostly forwarded to Manassas, where a battle must soon occur, if the enemy, now in overwhelming numbers, should advance. The Northern papers say the Yankee army will celebrate the 4th of July in Richmond. Nous verrons. But no doubt hostilities have commenced. We have accounts of frightful massacres in Missouri, by German mercenaries. Hampton has been occupied by the enemy, a detachment having been sent from Fortress Monroe for that purpose. They also hold Newport News on the Peninsula. There are rumors of a fight at Philippi. One Col. Potterfield was surprised. If this be so, there is no excuse for him. I think the President will make short work of incompetent commanders. Now a blunder is worse than a crime.