From Mobile

New York, Peb. 10. A Memphis letler duted tho 4th, saya a Germán who reachpd Grtjnd Gulf, Missiêsippi, a few days since, from Mobile, which he left on the 20th ult., representa tbat iho reuel troops in iind 'arouud that point do notexcted 5,000, and aro under comrnand of Major General Murrav, who has charge of the deíensos of tjio city. All pther troops havo reecnily bcon sent lo Atlanta in antioipation of ari attack there. The troops in and ■ abont Slo'pile are said to be tolerably well suppjjed vyith food and olothing. While on his way to onr lineg, the gentleman givinsr Ibis infonnaiion, paesed through Meridian, Mississippi, Hare, he flays, Gen. Polk has an anny vcriously eatimated at botween 15,000 ancj i'3,000. This coniprisea tho buikof th 'Ponfedcvn'.e forcea ffl