Wounded in battle by a cannonball, which broke one leg and injured the other, he was taken prisoner by the French, who set his leg and eventually allowed him to go home to Loyola. He spent his time recuperating at the home of his brother. Confined to his sick bed , he was given pious books to read, which he grudgingly accepted. To his surprise, he enjoyed them and began to dream of becoming a "knight for Christ", pursuing the ideals of St. Francis and St. Dominic. He eventually promised to devote his life to being a knight for St. Peter if he recovered, which he did after nine months of convalescence.
Ignatius noticed that after doing good deeds for the Lord, he felt peaceful -- which he termed as a "consolation", but when he thought of being a successful soldier or of impressing a beautiful woman where he had initially felt enthused, he later felt dry. Through this process of discernment, Ignatius was able to recognize that God was leading him to follow a path of service. Out of this experience he wrote his famous "Spiritual Exercises".
After traveling and studying in different schools, he finished in Paris, where he received his degree at the age of 43. Many initially hated St. Ignatius because of his humble and austere lifestyle. Despite this, he attracted many followers at the university, including St. Francis Xavier, and soon started his order, The Society of Jesus, or the Jesuits. He travelled to Europe and the Holy Land, then settled in Rome to direct the Jesuits. His health suffered in later years, and he was nearly blind at death. He died at the age of 65.
"If God causes you to suffer much, it is a sign that He has great designs for you, and that He certainly intends to make you a saint. And if you wish to become a great saint, entreat Him yourself to give you much opportunity for suffering; for there is no wood better to kindle the fire of holy love than the wood of the cross, which Christ used for His own great sacrifice of boundless charity."
"Few souls understand what God would accomplish in them if they were to abandon themselves unreservedly to Him and if they were to allow His grace to mold them accordingly."
~ Saint Ignatius of Loyola
Prayers of St. Ignatius of Loyola
Litany In Honor of St. Ignatius of Loyola
Works of St. Ignatius Online:
Letter on Obedience, by Saint Ignatius of Loyola