Though according to the Gospel of Pseudo-Matthew, the dragons adored Jesus.

CHAP. 18.--And having come to a certain cave, and wishing to rest in it, the blessed Mary dismounted from her beast, and sat down with the child Jesus in her bosom. And there were with Joseph three boys, and with Mary a girl, going on the journey along with them. And, lo, suddenly there came forth from the cave many dragons; and when the children saw them, they cried out in great terror. Then Jesus went down from the bosom of His mother, and stood on His feet before the dragons; and they adored Jesus, and thereafter retired. Then was fulfilled that which was said by David the prophet, saying: Praise the Lord from the earth, ye dragons; ye dragons, and all ye deeps And the young child Jesus, walking before them, commanded them to hurt no man. But Mary and Joseph were very much afraid lest the child should be hurt by the dragons. And Jesus said to them: Do not be afraid, and do not consider me to be a little child; for I am and always have been perfect; and all the beasts of the forest must needs be tame before me.

For some his other exploits as a boy detailed in other gospels deemed apocryphal, see Jesus the Child-killing Dragon-tamer?

Stories of Christian dragon fighters can be found in the late medieval bestseller the Golden Legend. The book contains not only the story of St. George and the dragon, but the story of St. Silvester exorcising a dragon.

In this time it happed that there was at Rome a dragon in a pit, which every day slew with his breath more than three hundred men. Then came the bishops of the idols unto the emperor and said unto him: O thou most holy emperor, sith the time that thou hast received Christian faith the dragon which is in yonder fosse or pit slayeth every day with his breath more than three hundred men. Then sent the emperor for S. Silvester and asked counsel of him of this matter. S. Silvester answered that by the might of God he promised to make him cease of his hurt and blessure of this people. Then S Silvester put himself to prayer, and S. Peter appeared to him and said: "Go surely to the dragon and the two priests that be with thee take in thy company, and when thou shalt come to him thou shalt say to him in this manner: Our Lord Jesu Christ which was born of the Virgin Mary, crucified, buried and arose, and now sitteth on the right side of the Father, this is he that shall come to deem and judge the living and the dead, I commend thee Sathanas that thou abide him in this place till he come. Then thou shalt bind his mouth with a thread, and seal it with thy seal , wherein is the imprint of the cross. Then thou and the two priests shall come to me whole and safe, and such bread as I shall make ready for you ye shall eat."

Thus as S. Peter had said, S. Silvester did. And when he came to the pit, he descended down one hundred and fifty steps, bearing with him two lanterns, and found the dragon, and said the words that S. Peter had said to him, and bound his mouth with the thread, and sealed it, and after returned, and as he came upward again he met with two enchanters which followed him for to see if he descended, which were almost dead of the stench of the dragon, whom he brought with him whole and sound, which anon were baptized, with a great multitude of people with them. Thus was the city of Rome delivered from double death, that was from the culture and worshipping of false idols, and from the venom of the dragon.

The author of the Golden Legend, Jacobus de Voragine, does say, however, that the tale of Saint Margaret of Antioch surviving being swallowed by a dragon is "apocryphal and not to be taken seriously."