The French invasion of Russia in 1812 became Napoleon's first big defeat. His army was badly damaged and never fully recovered. In 1813, another Coalition defeated his forces at Leipzig. The year after that, they attacked France and won. The Coalition exiled Napoleon to the island of Elba. Less than a year later, he escaped Elba and briefly returned to be the Emperor of France. However, he was defeated at the Battle of Waterloo in June 1815. Napoleon spent the last six years of his life exiled to the island of Saint Helena, which was controlled by the British, and died at the age of 51. A doctor said he died of stomach cancer. Some scientists think he was poisoned, though others disagree.