Today is the feast of Saint Michael the Archangel, and my oldest daughter, Michelle-Renee's patron. Here is his prayer, first in French, then Latin and finally in English.
In the liturgy of the Mass, Saint Michael is regarded as the Angel who leads the souls of the faithful departed to heaven: "Deliver them from the lion's mouth, that hell engulf them not, that they fall not into darkness; but let Michael, the holy standard-bearer, bring them into the holy light." (The Mass for the Dead, Offertory. )
Saint Michael is invoked in a particular manner in the prayers recited at the foot of the altar after Mass: "Saint Michael the Archangel, defend us in battle, etc." This particular prayer is a condensed form of the general exorcism against Satan and all the evil spirits, published by Pope Leo XIII.
Saint Michel Archange, défendez-nous dans le combat: soyez notre soutien contre la perfidie et les embûches du démon-
Que Dieu réprime son audace ! telle est notre humble prière.
Et vous, Prince de la milice céleste, par la vertu divine, refoulez en enfer Satan et les autres esprits mauvais, qui sont répandus dans le monde pour perdre les âmes.
Sancte Michaël Archangele, defénde nos in praelio, contra nequitam et insidias diaboli esto praesidium.-
Imperet illi Deus, supplices deprecamur: tuque, Princeps militiae caelistis, Satanam aliosque spiritus malignos, qui ad perditionem animarum pervagantur in mundo, divina virtute, in inférnum detrude.
Saint Michael, Archangel, defend us in battle. Be our defense against the wickedness and snares of the devil. May God rebuke him, we humbly pray. And you, Prince of the heavenly host, by the power of God, thrust into Hell Satan and the other evil spirits who prowl the world for the ruin of souls.
About the above prayer to St Michael...
Composed over 100 years ago, and then suppressed due to its startling content, Pope Leo XIII’s original Prayer to St. Michael is one of the most interesting and controversial prayers relating to the present situation in which the true Catholic Church finds itself. On September 25, 1888, following his morning Mass, Pope Leo XIII became traumatized to the point that he collapsed. Those in attendance thought that he was dead. After coming to consciousness, the Pope described a frightful conversation that he had heard coming from near the tabernacle. The conversation consisted of two voices – voices which Pope Leo XIII clearly understood to be the voices of Jesus Christ and the devil. The devil boasted that he could destroy the Church, if he were granted 75 years to carry out his plan (or 100 years, according to some accounts). The devil also asked permission for “a greater influence over those who will give themselves to my service.” To the devil’s requests, Our Lord reportedly replied: “you will be given the time and the power.”
Shaken deeply by what he had heard, Pope Leo XIII composed the original Prayer to St. Michael (which is also a prophecy) and ordered it to be recited after all Low Masses as a protection for the Church against the attacks from Hell.
Note: The above photo of St Michael, from an Orthodox site, shows the Archangel, St. Michael holding a mirror. This is an interesting point, the Achangel humbly never looks upon the face of God directly but only at HIS reflection in the mirror.