Correspondence of the N. O. Delta.

OFF MOBILE, Jan. 16, 1803.

There was great commotion among the blockading fleet off this harbor last evening. The rebel steamer Oreto, which has been lying in Mobile Bay for some months, succeeded in escaping to sea in presence of seven blockading vessels. The R. R. Cuyler, one of our fastest steamers, immediately gave chase and was gaining on her when the two disappeared in the distance. The Cuyler was firing at her continually during the chase from her long range guns, and as she was gaining rapidly, great hopes are entertained that she will bring the audacious Rebel to. The Oreto is commanded by Maffit, formerly of the United States Navy.