The climax of Saruman's campaign against the Rohirrim is the Battle of Helm's Deep. In this bloody siege, the once great and wise Wizard, now hopelessly fallen to the will of darkness, sends down upon the Rohan people a great host of Uruk-hai warriors. Bred in secret beneath his fortress, and armed for war by the foundries of Isengard, the Uruk-hai bare into battle the heraldry of the White Hand, Saruman's emblem and the banner of his treachery.