  We demonstrate that semiclassical fluctuations, their relaxation, and the
chiral phase transition are automatically incorporated in the numerical
simulations of the classical equations of motion in the linear $\sigma$-model
when longitudinal and transverse expansions are included. We find that domains
of disoriented chiral condensate with 4--5 fm in size can form through a quench
while an annealing leads to domains of smaller sizes. We also demonstrate that
quenching cannot be achieved by relaxing a chirally symmetric system through
expansion.
