  Late accretion models for formation of the Galactic halo require that many
Galactic satellite galaxies have been cannibalised into the halo field.
Comparison of the metallicity and age distribution function of stars in the
surviving satellites with the apparently exclusively old stars in the field
halo can constrain the importance of any such process. We have developed a new
objective technique to determine star formation histories in dSph galaxies. We
apply this technique to the surviving Galactic satellites, deducing an
approximately uniform distribution of ages for the constituents, quite unlike
the halo field stars. Thus, late accretion did not play a substantial part in
Galactic halo formation.
