The soul of his party was Oliver Cromwell. Bred to peaceful occupations, he had, at more than forty years of age, accepted a commission in the parliamentary army. He saw precisely where the strength of the Royalists lay, and by what means alone that strength could be overpowered. He saw that it was necessary to reconstruct the army of the Parliament. He saw also that there were abundant and excellent materials for the purpose, materials less showy, indeed, but more solid, than those of which the gallant squadrons of the king were composed. It was necessary to look for recruits who were not mere mercenaries, for recruits of decent station and grave character, fearing God and zealous for public liberty. With such men he filled his own regiment, and, while he subjected them to a discipline more rigid than had ever before been known in England, he administered to their intellectual and moral nature stimulants of fearful potency. Cromwell made haste to organize the whole army on the same principles on which he had organized his own regiment. As soon as this process was complete, the event of the war was decided. The Cavaliers had now to encounter natural courage equal to their own, enthusiasm stronger than their own, and discipline such as was utterly wanting to them. It soon became a proverb that the soldiers of Fairfax and Cromwell were men of a different breed from the soldiers of Essex. At Naseby took place the first great encounter between the Royalists and the remodeled army of the Houses. The victory of the Roundheads was complete and decisive. It was followed by other triumphs in rapid succession. In a few months the authority of the Parliament was fully established over the whole kingdom. Charles fled to the Scots, and was by them, in a manner which did not much exalt their national character, delivered up to his English subjects.