Gregg’s Brigade at Cbickamauga.IPeraonna, the long and well known correspond ent of the Charleston Courier, la now writing to theMobile News. ille is, perhaps, the ableat and most reliable of all newspaper corespondents. Illsrnmuic v* mvt-v,-, ..---_letter is dated from before Chattanooga, Oct. Jin,tltiaaPheDacItand gives aullntereatlng account of achievements it Gregg’* Brigade and of the 7lh Texas, 'which Is In that Brigade.) both before and in the battle of Ohictfsraaugv The following nctrao cannot fall to be Ihtereaiinif our renders : IA brief blstliry of the movements of the brigade ] t prior to the bkttle of OhioUamauga will ,lh;,iut Its Intereif, as lllluatratlng the n^madlo life of the soldier. The cohimaDd was organised as It now cstands, after theexomn*« of the {fort r^p.ne'4°n l)rj •oners, in October, 18132, and consists of the 7th Tsip *as, lUltt. 30thi 41st and 50tb Tennest.ee |The 7th;Te*», 001. H B. Oranbury, was one of the five Texan Jegiments which originally enlisted for « the war, the htbefs 1 Mpg the and 5th, dow 1 ibelonging to ftood’s Division, and Terry a Moving tolMhaiaslppl. the tylgade was ,nthe sklrmishj ati Abbeville, and the battle of Ohl0*®' «aw Bayou. I At this) time ther Texaa regiment was one of the garrison at Port Hudaon, and there remained uptfl tfca^tb of April, when, with Bledtoe s Missouri Battery, it left under orders fromGardner,tojintercept, Grieraon,, who wasIng a triumphant tour through the State. The iu | ] ana wire r.ot mono tad; although every man of^them may ba aaldJ to have been **horn on a horse, /and after traveling one hundred miles in fou* day a, the pursuit waa abandoned. Meeting the remainder of the brlgadJatOsyka, tje command was now ^ovvl to Jackaoni Mlaa , whidh waa reached on tb* 9th of May. On Jtbe lith It marched to Raymond, and on the 12th gave battle to McPberton’. corps of Grant a army; Mow enaued one of the most brilliant eplsodas of that entire csmpalgn. Our little force num* bered only twenty*two hundred men. while thatf of the enemy was fully twenty tbouiand. Th#3d Ttn-neasee and the 7th Tams were put In the front and