St. George was a Roman military officer of the 3rd century, who is well-known around the world for a particular legend connected to his life. He is said to have mounted his horse and killed a dragon with his lance, protecting villagers (and in one story a beautiful maiden).
Many believe the story was meant to represent his ability to conquer sin and temptation, and that the dragon was more of a "demonic force," than an actual beast. With this in mind, St. George has been known as a powerful intercessor against temptations and can aid a person who is struggling against the powers of evil.
Below is a brief prayer that invokes St. George's intercession, asking him for help in spiritual warfare.
Faithful servant of God and invincible martyr, St. George; favored by God with the gift of faith, and inflamed with an ardent love of Christ, thou didst fight valiantly against the dragon of pride, falsehood, and deceit. Neither pain nor torture, sword nor death could part thee from the love of Christ.
I fervently implore thee for the sake of this love to help me by thy intercession to overcome the temptations that surround me, and to bear bravely the trials that oppress me, so that I may patiently carry the cross which is placed upon me; and let neither distress nor difficulties separate me from the love of Our Lord Jesus Christ.
Valiant champion of the Faith, assist me in the combat against evil, that I may win the crown promised to them that persevere unto the end.