_April 30._--This afternoon our column reached the Rapidan at Raccoon Ford, and began to cross over. The water being much above the fording mark and very rapid, we had an exciting time. Several horses and men were swept down the stream by the swift current and were drowned; and none of us escaped the unpleasant operation of getting wet. After reaching the high plateau on the south bank of the river, the entire corps were formed in line of battle, in which hostile position we were ordered to spend the night. For more thorough protection, pickets had been sent out in every direction, and posted with much care. It was a season of considerable anxiety to all, and of great fatigue especially to those of us who had been in the saddle several consecutive days and nights. Standing to horse as we were compelled to do, very little rest could be obtained, though many were so exhausted, that, dropping to the earth, with bridle and halter in hand, they fell asleep, while their comrades wished for the morning, which came at last. After our frugal breakfast, which consisted mostly of hard-tack and coffee, a thorough inspection of the command was made, and all men reported to have unserviceable or unsafe horses, were sent to the rear. The weather is perfectly charming to-day, although quite too warm, in the midday heat, to be comfortable marching. _May 2._--Early in the morning our column reached the railroad, in the rear of General Lee's army, and, with slight opposition from scattered pickets, the work of destruction began. Culverts and bridges, telegraph lines and posts, disappeared like the smoke of their burning. KILPATRICK AT LOUISA COURT HOUSE. While this work was going on, Kilpatrick was ordered to lead the Harris Light into Louisa Court House, which he did in a gallant manner. The inhabitants, taken by surprise, were greatly terrified at our approach and entry into the place, but finding themselves in the hands of men, and not fiends, as they had been wont to regard us, and receiving from us neither disrespect nor insult, soon dispelled their needless fears. We remained in town until two o'clock P. M., tearing railroad track and destroying railroad property, as well as commissary and quartermaster stores found in public buildings. At the hour above named we were ordered out to support the First Maine Cavalry in a spirited skirmish with Rebel cavalry. In this engagement our Troy company had one sergeant wounded, and one corporal and four men taken prisoners.