Michael is an archangel and the leader of the angels who remained faithful to God. At their head he overcame Lucifer and the bad angels and cast them out of heaven. "And there was a great battle in heaven, Michael and his angels fought with the dragon." St. John speaks of the great conflict at the end of time, which reflects also the battle in heaven at the beginning of time. Many times he has aided those who were faithful to God; he will again come to the aid of the faithful.
Tradition gives to St. Michael four offices: 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). To call away from earth and bring men's souls to judgment
Patron Saint of those in Law Enforcement.
Gabriel is an archangel whose name means "the Power of God." He appeared to the prophet Daniel (Daniel 8:16; 9:21), to the priest Zachary to announce the forthcoming birth of Saint John the Baptist (Luke 1:11, 19), and to the Blessed Virgin Mary to announce the birth of Our Savior (Luke 1:26ff.). Gabriel is mentioned only twice in the New Testament, but it is not unreasonable to suppose with Christian tradition that it is he who appeared to St. Joseph and to the shepherds, and also that it was he who "strengthened" Our Lord in the garden.
Raphael is the archangel which appears disguised in human form as the travelling companion of the younger Tobias, calling himself "Azarias the son of the great Ananias". The story of the adventurous journey during which the protective influence of the angel is shown "in the desert of upper Egypt" of the demon who had previously slain seven husbands of Sara, daughter of Raguel, (Tob. 5:11). After the return and the healing of the blindness of the elder Tobias, Azarias makes himself known as "the angel Raphael, one of the seven, who stand before the Lord"
Of the seven "archangels", only three, Gabriel, Michael and Raphael, are mentioned in the canonical Scriptures. The others, according to the Book of Enoch are Uriel, Raguel, Sariel, and Jerahmeel, while from other apocryphal sources we get the variant names Izidkiel, Hanael, and Kepharel instead of the last three in the other list.