iÍEMPins, Jan. 11, via Cairo, Jan'. 13. Capt. Moore, of the Twentielh. Illinois Cavalry, Lieut. Herrón, Company G, Fiftj-seventh Illinois Mounled Infantry, the whole.couiposing a forcé of ubout 200 men, at sunrise, on Tliursday ínorning, carne suddenly oc tlie rebol camp ot Lieut. Col. Dnwson, Ripley, 200 strong. They dispersed thi;in in every direction, wounáing tweniy, and tak ing forty-six pi isüi'.crs iiao-ug the ui ope reb cl Major, two Captains, t.vo Licuienants, twenty horses, aud two wagon loads of mns. These Confederates have been busily engsged for some weeks burniuir all t!ie ooi ton tlicy could find iu that part of the country. Captain Moore, in tliis bri.liant engagement, did not lose a man, and liad only tliree wounded. Cairo, Jan. 13. Passengers from Memphis report that Porter's squadron had arrivèd at the mouth of White river. Purt of it had oonimcnced to ascend the stream, accompanied by a heavy land force under Gen. MoClernand. General Gra.it and staff has árrived at Mcmphis, Holly Springs is reported almost con sumed. The railroad th:re has been taken up, and tho rails brought to Mem ph is.