In 1628, Cromwell became an MP and a Puritan and supported Parliament in its quarrel with the King. When war broke out, the King's army was stronger and better-prepared than the army of Parliament. Cromwell saw this, and he decided to train men to fight better. Soon the "New Model Army" he had trained began to win battles. As a result, Parliament won the war. By the end of the war, Cromwell was very powerful.