My favourite image of St Michael is copyright, so on the grounds that a mighty spirit cannot be reduced to pixels on a page, this post will leave nearly everything to your imagination.
Today's feast used to be extremely popular in the Midddle Ages. The Masses and prayers recorded in various sacramentaries testify to a rich liturgical observance, paralleled by a lively cluster of customs and traditions, from the Michaelmas goose (yummy) to Michaelmas fairs (fun) and Michaelmas rent-paying (depends whether paying or receivng, I suppose).

The old Catholic Encyclopedia neatly summarises the role of St Michael as

• To fight against Satan.

• To rescue the souls of the faithful from the power of the enemy, especially at the hour of death.
• To be the champion of God's people, the Jews in the Old Law, the Christians in the New Testament; therefore he was the patron of the Church, and of the orders of knights during the Middle Ages.
• To call away from earth and bring men's souls to judgment ("signifer S. Michael repraesentet eas in lucam sanctam", Offert. Miss Defunct. "Constituit eum principem super animas suscipiendas", Antiph. off. Cf. The Shepherd of Hermas, Book III, Similitude 8, Chapter 3).

Note that the first of these is to fight against Satan. One of the worrying trends many of us have come up against is the increase in occult activity which can have devastating consequences for those involved. Some are drawn in the first instance by sheer curiosity and have no inkling that they are playing with fire. At the risk of being labelled impossibly old-fashioned and credulous by those who prefer to laugh at the idea of evil, here is the prayer of Pope Leo XIII which John Paul II asked everyone "not to forget and to recite . . . to obtain help in the battle against the forces of darkness and against the spirit if this world" (Sunday, 24 April 1994).

Saint Michael the Archangel,
defend us in battle.
Be our protection against the wickedness and snares of the devil.
May God rebuke him, we humbly pray;
and do Thou, O Prince of the Heavenly Host —
by the Divine Power of God —
cast into hell, Satan and all the evil spirits,
who roam throughout the world seeking the ruin of souls.
Amen.
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