  A model is presented in which supernova-driven winds from early galaxies
reionize the intergalactic medium by z=5. This scenario can explain the
observed absence of a Gunn-Peterson trough in the spectra of high-redshift
quasars providing that the bulk of these early galaxies are quite small, no
more massive than about 10^8 solar masses. It also predicts that most of the
IGM was enriched to at least 10% of current metal content by z=5 and perhaps as
early as z=15. The existence of such early mini-galaxies violates no spectral
constraints and is consistent with a pure CDM model with b<2. Since the final
radius of a typical ionized bubble is only around 100 kpc, the induced
modification of the galaxy autocorrelation function is negligible, as is the
induced angular smoothing of the CMBR. Some of the gas swept up by shells may
be observable as pressure-supported Lyman-alpha forest clouds.
