I was reading about him in the booklet from Tan Books, and reminded that St. Michael is one of the greatest angels, charged by God to protect us from Satan, whose forces he drove from heaven; and yet the prayer to him closing Low Mass in the Latin Mass, was dropped from the New Mass.

Here is that prayer:

“Holy Michael Archangel, defend us in the day of battle; be our safeguard against the wickedness and snares of the devil.—May God rebuke him, we humbly pray: and do thou, Prince of the heavenly host, by the power of God thrust down to hell Satan and all wicked spirits, who wander through the world for the ruin of souls. Amen.”

There was a wonderful apparition of St. Michael, as the Magnificat website writes, entitled: Apparition of St. Michael the Archangel at Monte Gargano, Italy, in the year of our Lord 492.

An excerpt.

“In the year 492 a man named Gargan was pasturing his large herds in the countryside. One day a bull fled to the mountain, where at first it could not be found. When its refuge in a cave was discovered, an arrow was shot into the cave, but the arrow returned to wound the one who had sent it. Faced with so mysterious an occurrence, the persons concerned decided to consult the bishop of the region. He ordered three days of fasting and prayers. After three days, the Archangel Saint Michael appeared to the bishop and declared that the cavern where the bull had taken refuge was under his protection, and that God wanted it to be consecrated under his name and in honor of all the Holy Angels.

“Accompanied by his clergy and people, the pontiff went to that cavern, which he found already disposed in the form of a church. The divine mysteries were celebrated there, and there arose in this same place a magnificent temple where the divine Power has wrought great miracles. To thank God’s adorable goodness for the protection of the holy Archangel, the effect of His merciful Providence, this feast day [May 8] was instituted by the Church in his honor.”

And the site of that Shrine still exists, as Wikipedia reveals.