  We present the results of our spectroscopic follow-up program of the X-ray
sources detected in the 942 ks exposure of the Chandra Deep Field South (CDFS).
288 possible counterparts were observed at the VLT with the FORS1/FORS2
spectrographs for 251 of the 349 Chandra sources (including three additional
faint X-ray sources). Spectra and R-band images are shown for all the observed
sources and R-K colours are given for most of them. Spectroscopic redshifts
were obtained for 168 X-ray sources, of which 137 have both reliable optical
identification and redshift estimate (including 16 external identifications).
The R<24 observed sample comprises 161 X-ray objects (181 optical counterparts)
and 126 of them have unambiguous spectroscopic identification. We introduce a
new classification based solely on X-ray properties, HR and X-ray luminosity,
consistent with the unified AGN model. This X-ray classification uncovers a
large fraction of optically obscured, X-ray luminous AGNs missed by the
classical optical classification.
