The Feast of St. Michael and All Angels
The feast features Michael the Archangel prominently because tradition accords him the honor of chief of all the angels. The principle reading on this day is from the twelfth chapter of the Revelation of John, which describes Michael leading the hosts of heaven against Satan (depicted as a dragon) and his own army of fallen angels, and defeating them. Michael is also traditionally known as the herald of the Second Coming of Jesus, as mentioned in 1 Thessalonians 4:16.
In England especially, the feast and the autumn season as a whole it inaugurates is known as "Michaelmas." The popularity of this feast at the time of the Reformation is manifest in its being one of only a handful of medieval festivals which survived Thomas Cranmer's pruning of the church calendar in the Book of Common Prayer.
The feast is a special memorial of the protection the saints of God on earth have in the angels of heaven. This is an especially appropriate day to pray for those at risk of physical violence or spiritual oppression, those who are facing the normal perils of travel, and those tasked to keep the peace: members of the military and especially police officers and other emergency workers.
Everlasting God, you have ordained and constituted in a wonderful order the ministries of angels and mortals: Mercifully grant that, as your holy angels always serve and worship you in heaven, so by your appointment they may help and defend us here on earth; through Jesus Christ our Lord, who lives and reigns with you and the Holy Spirit, one God, for ever and ever. Amen.