The official historian of MI5, Christopher Andrew, wrote two books, "The Sword and the Shield" (1999) and "The World Was Going Our Way: The KGB and the Battle for the Third World" (2005), based on material in the archives. The books purport to provide details about many of the Soviet Union's clandestine intelligence operations around the world. They also provide specifics about Guy Burgess, a British diplomat with a short career in MI6, said to be frequently under the influence of alcohol; the archive indicates that he gave the KGB at least 389 top secret documents in the first six months of 1945 along with a further 168 in December 1949.