Lee Resigns. '' He went with his State because he believed it was his duty to do so, and because, to ascertain what was his duty, and perform it, was the cardinal maxim of his life.'' Lee's sense of duty to his State was so strong, he left his Estate, Arlington, Martha Washington's furniture and china, and over 25 years of service to the Union behind to ''Draw his sword'' for a cause he disagreed with.