arXiv:astroph/0312324 v2 7 Jul 2004 The Chandra Deep Field South: Optical Spectroscopy I. 1 G. P. Szokoly 1;2 , J. Bergeron 3 , G. Hasinger 1;2 , I. Lehmann 1 . L. Kewley 4;5 , V. Mainieri 6 , M. Nonino 7 , P. Rosati 6 , R. Giacconi 8 , R. Gilli 9 , R. Gilmozzi 6 , C. Norman 4 , M. Romaniello 6 E. Schreier 8;10 , P. Tozzi 7 , J. X. Wang 4 , W. Zheng 4 and A. Zirm 4 szgyula@mpe.mpg.de ABSTRACT We present the results of our spectroscopic follow-up program of the X-ray sources detected in the 942 ks exposure