And there was war in heaven. Michael and his angels fought against the dragon, and the dragon and his angels fought back. But he was not strong enough, and they lost their place in heaven. The great dragon was hurled down—that ancient serpent called the devil, or Satan, who leads the whole world astray. He was hurled to the earth, and his angels with him.
Then I heard a loud voice in heaven say:
"Now have come the salvation and the power and the kingdom of our God,
and the authority of his Christ.
For the accuser of our brothers,
who accuses them before our God day and night,
has been hurled down.
They overcame him
by the blood of the Lamb
and by the word of their testimony;
they did not love their lives so much
as to shrink from death.
Therefore rejoice, you heavens
and you who dwell in them!
But woe to the earth and the sea,
because the devil has gone down to you!
He is filled with fury,
because he knows that his time is short."
A well-known Michaelmas hymn is Ye Watchers and Ye Holy Ones.