Answer:
   
   As Ezekiel writes, there will be a king (Gog) who leads his nation
   (Magog) in a final war. Who that king will be, and which country, is
   unknown--or even if that ruler arrived already (for it is possible the
   war described by Ezekiel was WWII... no one knows.)
   
   In Tractate Succos, the Talmud tells a story about the dawn of the
   messianic era. The nation of Magog will complain to G-d that their
   fate is unfair. Israel recieved the Torah and they did not! Why should
   they be judged as less than Israel because of an opportunity they were
   not given? G-d offers them a single mitzvah, sitting in the Succah,
   the thatched roof hut of the Succos holiday. We are told that they
   will try this mitzvah, but give up in anger when the weather gets too
   hot, the commandment too difficult. The Talmud concludes that the
   problem was not in their giving up, but in their anger. The language
   of the story is "kicking the door on their way out."
   
   Whatever this story comes to teach us, I wanted to point out a
   language connection. A gag is a roof. Magog would be a roofer. The
   Succah is noted for its sechach (from which it gets its name): a
   thatched roof that is thin enough to let rain through. A Succah does
   not protect you from the elements; it serves as a reminder that
   protection comes from G-d. Man must put in effort--we live in a
   Succah, not out of doors--but only with Divine Aid can we succeed.
   Magog is challenged with this commandment in particular because the
   message they convey is "my might and the strength of my hand won for
   me this war". In distinction to the message of the Succah, they feel
   they can provide their own roofs, their own self-protection. It is
   this notion that must fall before the messianic era can emerge.