MONOCACY JUNCTION, 2 P. M.—While there is no doubt that the major force of the rebels which had besieged Winchester are still in Virginia, it is generally believed that the cavalry and artillery, under Jenkins, who had the fight with Gen. Tyler at Martinsburg, have crossed into Maryland, either above or at Williamsport. It is asserted here quite confidently that rebel cavalry were in Hagerstown at 8 o’clock this morning, but the only positive fact I have been able to learn is that the telegraph line between Frederick and Hagerstown has ceased entirely to work. As there was no storm to damage the line, the inference is that it has been cut, and of course that the rebels have done it. It was a so reported at Harper’s Ferry that a small force of rebel cavalry had been in Sharpsburg. The stage which left Hagerstown early this morning, passing through Middletown, arrived at the usual time, having met with no interruption; nothing having been seen or heard of the rebels along the turnpike.

The following is the official dispatch of Brigadier General Kelly, relative to the stolen cattle in Hardy county, Virginia

CUMBERLAND, Md Oct. 29.

Brigadier General H. B. MARCY, Chief of Staff: I ordered Lieutenant Colonel Quick, of the 23d Illinois, to take the Ringgold cavalry and two guns of Rourk’s battery, and pursue the party that took the cattle in Hardy county. He left New Creek last night at dark, and by a rapid march all night he overtook the enemy at daylight this morning, attacked him, and recaptured 170 head of cattle, and took 10 prisoners and 20 horses.