St. Michael — Archangel September 29

The Archangel Michael is invoked in the Confiteor, the Church summons him to the side of her children in the agony of death, and chooses him as their escort from purgatory to heaven.

Holy Archangel Michael, defend us in the battle; that we may not perish in the dreadful judgment. — Gradual of the Feast

The Imitation of Christ
Fight like a good soldier; and if sometimes thou fall through frailty, resume with greater courage than before, confiding in My more abundant grace. But take very great care against vain complacency and pride.
St. Michael knows by victorious experience how to fight and to conquer the devil and his hosts. We pray to him each day after Mass, if you notice, for victory over the devil.
Cultivate a devotion to St. Michael and to the angels in general. We are inclined to take the angels and their ministrations very much for granted. They are powerful intercessors with God; you will find them very prompt in their attention to your prayers if you call upon them often.
He hath given his angels charge over you to keep you in all your ways. — Psalm 90