I have the honor to report my command at this point to-night. I commenced moving back from Port Republic, Mount Crawford, Bridgewater, and Harrisonburg yesterday morning. The grain and forage in advance of these points up to Staunton had previously been destroyed. In moving back to this point the whole country from the Blue Ridge to the North Mountains has been made untenable for a rebel army. I have destroyed over 2,000 barns filled with wheat, hay, and farming implements; over seventy mills filled with flour and wheat; have driven in front of the army over 4,000 head of stock, and have killed and issued to the troops not less than 3,000 sheep. This destruction embraces the Luray Valley and Little Forest Valley, as well as the main valley. A large number of horses have been obtained, a proper estimate of which I cannot now make. Lieut. John R. Meigh, my engineer officer, was murdered beyond Harrisonburg, near Dayton. For this atrocious act all the houses within an area of five miles were burned. Since I came into the Valley, from Harper's Ferry up to Harrisonburg, every train, every small party, and every straggler has been bushwhacked by people, many of whom have protection papers from commanders who have been hitherto in this valley. From the vicinity of Harrisonburg over 400 wagon-loads of refugees have been sent back to Martinsburg; most of these people were Dunkers and had been conscripted. The people here are getting sick of the war; heretofore they have had no reason to complain, because they have been living in great abundance. I have not been followed by the enemy up to this point, with the exception of a small force of rebel cavalry that showed themselves some distance behind my rear guard to-day. A party of 100 of the Eighth Shenandoah, near Mount Jackson, was attacked by McNeill, with seventeen men; report they were asleep, and the whole party dispersed or captured. I think that they will all turn up; I learn that fifty-six of them have reached Winchester. McNeill was mortally wounded and fell into our hands. This was fortunate, as he was the most daring and dangerous of all the bushwhackers in this section of the country. I would have preferred sending troops to you by the Baltimore and Ohio Railroad; it would have been the quickest and most concealed way of sending them. The keeping open of the road to Front Royal will require large guards to protect it against a very small-number of partisan troops. It also obliges me to have a pontoon train, if it is to be kept open, to bridge the Shenandoah and keep up communication with Winchester. However, in a day or two I can tell better. I sent a party of cavalry through Thornton's Gap, and directed the balance of the division of cavalry which I have left in the Valley to take position at Millwood, occupying Chester Gap and Front Royal. Thornton's Gap I have given up, as of no value. With this disposition of forces, I will move infantry round the mountains, via Strasburg, as soon as possible. To-morrow I will continue the destruction of wheat, forage, &c., down to Fisher's Hill. When this is completed the Valley, form Winchester up to Staunton, ninety-two miles, will have but little in it for man or beast. In previous dispatches I have used "lower Valley" when I should have said "upper Valley," or, in other woods, in my last dispatch I intended to say that the grain and forage from Staunton up to Lextington had been sent to Richmond, and that the grain and forage from Staunton to Strasburg had been left for the wintering of Early's army. Yesterday Col. Powell captured a guerrilla camp on the mountains, with ten wagons and teams.