...urt-House and Centreville, crosses Bull Run, on its way to Warrenton. The works, armed with naval guns, were manned by the seamen already alluded to, and also by a force of the State militia, which Governor Letcher had called out, at General Beauregard's request. During the latter days of June and the first fortnight of July, thorough reconnoissances were made of the whole region of country likely to become...