New York, Jan. 7. - A lotter from Harper'a states tbat Cole's Marylaad cavalry have níet with a serious "clisas ter - 57 out of 75 men being either captured or killed, near Rectortown, Va , where they enconntercd an overwhelming forea of rebels. Cincinnati, Jan. V". - A special to the Commercial, from Cumberland Gap, Jan. 6, smys nn overwhelming foice, under Snm. Jones, nttacked our troops at Jonesville, Va., consisting of about 300 men, on Sund;iy last. Aiter a desperate resistance, onr troops surrendered, losing 30 killed, 30 woonded, 1 gnD una 2 gfnall bowit?.ere, '