  We study dynamics of a chiral soliton lattice (CSL) in a classical
one-dimensional spin chain coupled to the conduction electrons under an
electric field. The CSL has attracted much interest because its period can be
easily controlled by an external magnetic field. We clarify the dependence of
the CSL dynamics on its period. A collective coordinate and an SU(2) gauge
method are used for the analysis. It turns out that the velocity of the CSL
becomes slower as the period becomes longer. We also mention a relation between
the velocity and the magnetic resistance.
