Our Army Correspondence.rmitii if ROM THE FJITH WIS-COSMN ULvIMLIiT.C AX PAi/vanc:k, Faiifax Co. Va. J September, 16th 1SC1. )Thit r lin plliDicah Since I lastwrote you, there has been quite a change in our location, which was then in the Distiict of'Columhia, blit is now situated in Fairfax comity, Va., only a few miles fiom Fairfax 0. H., where there is a large force of secession troops. We have been here about two weeks. We came over the Ipotomac in the night, crossing the chain bridge about 12^ o'clock- in the night and marching about half a mile wheie we lay on out arms, the ballance ot the night, in an old coin field, and the next morning going light to work building a fuit lor the piotoction of the bridge. We have worked pretty h cady on the fort, and have got one that wheu sccefcli wants to take it they can h.n e a chance. You have pioha-bly cic this*, got the nev of n battle which we had on the lllh inst, which v a** fought .bout thice miles from here, at a place called Lowins'-illc.— The 5th regiment was ordeiccl to proceed to the field whcie the battle was in progicto*, and we had got about two miles on our march, when six companies were taken out of the regiment to relieve the pickets, and our company was one of them, so we did not get a chaneo to shoot at any of the *lse-coshers” We were on picket guard all night—the rain pouring down in perfect torrents all tho time. You can judge for yourself how we liked it, having to keep one or both eyes open all the time, or stand a good chance of being shot by some ugly secesli, who ’ I are prowling around all the time seek-11 | ing whom they may destroy. Last Friday night we were called out, and expected to get a shot at some of their ugly face*, but were fooled somewhat,having to lay on the ground all nightwith our arms so that we could get them in a minute. The cause of the 6 I ahum was from the secessionists throwing some shells at about a dozen pickets who were stationed at a house out out on the picket lines, about two miles fiom our camp. They weie soon warned to let them alone, by a few pieces of ‘canuonon FoitEthan Allen, the place where we arc encamped.De to lt;mu wli the int antiocitJcCOcaCOthrodituthmfirIKin1Co«VVis0c3PeaaIaat1as;ym They have been rnaking-quite a haulof secessionists lately, having arrested k some fifteen or tv'cnty of* them at Halit timore yesterday. Among them w01cidtel1ur,Dlt,allodiote©Ipsome four or five members of the secession legilatuie of Maryland, the mayor of the city, the editors of the Baltimore South, and Exchange, and a number of tho prominent citizens.— They have all got good quarters in Fort McHenry near Baltimore. Some of our men arrested a spy day before yesterday and be was sent to Fort Lafayette, New York. Every day the pickets bring 'in some prisoners that have come across their lines while on duty.There will probably be more news to write in a few days, and then you will hear from me again'. •Yours, most Respectfully, y1 f * OPYT.