The second day of the Durga Puja, Astami, is considered
the peak of the three day celebration, because it is on
this day that the goddess'
victory over the buffalo-demon
Mahish is remembered.
Traditionally, it is also on this day that a goat or
buffalo is sacrificed. By this ritual act, the forces
of evil are vanquished here on Earth, recalling Durga's triumph over
the buffalo-demon on the battlefields for the possession
of heaven itself.