  We propose that in QCD with dynamical quarks, colour deconfinement occurs
when an external field induced by the chiral condensate strongly aligns the
Polyakov loop. This effect sets in at the chiral symmetry restoration
temperature T-chi and thus makes deconfinement and chiral symmetry restoration
coincide. The predicted singular behaviour of Polyakov loop susceptibilities at
T-chi is shown to be supported by finite temperature lattice calculations.
