Veterans Day Rememberance

Today is the 90th Anniversary of the Armistice that ended World War I, sometimes referred to as the "Great War" or the "War to End all Wars". Although the Armisitce was signed at 5 AM on November 11, 1918, it did not take affect until 11:00 AM, becoming what is referred to as the "eleventh hour, of the eleventh day, of the eleventh month".

My question is what is the significance of the 11-11 at 11:00 AM? Why not put the Armistice in effect at 5 AM when it was signed. Some have suggested that this time and date were chosen to ensure the significance of the armistice. Does anyone have any thoughts?

The two best sources on the Great War are Barbara Tuchman's Guns of August and Eric Remarque's All Quiet on the Western Front. Remarque's book is actually a novel, however it draws on his first hand experience as a soldier during World War I so it can be used as a reliable source of the conditions of the war.