Commandant's residence. In 1894, Lee initiated a Military Survey of the Canadian Frontier, and supervised its progress until its completion in 1896. During the summer of 1897 he was a Special Correspondent for the London Daily Chronicle, covering the earlier stages of the Klondike Gold Rush, based on his travels to Alaska and the Yukon. In 1900, when Lee resigned as British Military Attaché in Washington, D.C., Colonel Kitson resigned as Commandant of RMC to take over the Washington post vacated by Lee. Diplomatic postings He did not receive substantive promotion until the completion of his RMC appointment on 18 April 1898. He became the British military attaché with the United States Army in Cuba during the Spanish–American War, later in 1898. He received the U.S. campaign medal, was made an honorary member of the 1st U.S. Volunteer Cavalry—the famous Roosevelt's "Rough Riders"—and met Theodore Roosevelt. On 28 January 1899 Lee, who was still not 30 years old, was appointed military attaché at the British Embassy in Washington, with the temporary rank of Lieutenant Colonel (for the duration of his appointment). Although he would have preferred to have been on active service in South Africa, since the Boer War had just started, Lee enjoyed the challenging diplomatic assignment and became a regular correspondent of Roosevelt. Theodore Roosevelt wrote of Lee: "The military attachés came out to look on-English, German, Russian, French and Japanese. With the Englishman, Captain Arthur Lee, a capital fellow, we soon struck up an especially close friendship; and we saw much of him throughout the campaign." Roosevelt also wrote:"Captain Lee, the British attaché, spent some time with us; we had begun to regard him as almost a member of the regiment." Later in life Theodore Roosevelt wrote to Rudyard Kipling and told him not to share the contents of the letter with anyone, "except Arthur Lee, to whom you are entirely at liberty to show it." Marriage, retirement from military On 23 December 1899 Lee married Ruth Moore (died 1966), daughter of New York banker John Godfrey Moore. He had first met her at parties in Kingston and Gananoque, and had taken her to balls at the Royal Military College, Kingston. Ruth was left a substantial inheritance after her father's death shortly before the wedding. Lee was promoted brevet major on 8 August 1900, returned to regimental duty on 22 August 1900, and retired from the army