...erience in sketching topography, and, this being our first essay in the military line, we were ridiculously minute, and consequently very slow. I left Manassas March 3d, on my reconnaissance to the Rappahannock ; I taking the upper route, and sending Lieutenant Randolph, who had just reported, by the lower. I reported to you on the 6th, at Centreville; received orders on the 7th to prepare Rappahannock Bri...