  The Milky Way and Andromeda must have formed through an initial epoch of
sub-structure merging. As a result of fundamental physical conservation laws
tidal-dwarf galaxies (TDGs) have likely been produced. Here we show that such
TDGs appear, after a Hubble-time of dynamical evolution in the host dark-matter
halo, as objects that resemble known dSph satellite galaxies. We discuss the
possibility that some of the Milky Way's satellites may be of tidal origin.
