The major reason Napoleon's invasion of Russia failed was because he attacked at the wrong time.
Granted, summer is generally the time used to start invasions against cold-weather countries (as seen by the invasion of France and Germany in their respective times). However, many of them did not think of a long-term fight, and were generally tied up in the western-half of Russia, before being beaten back by weather, shortages, and the Russians.
~<em>Rise Above the Ordinary</em>
B because the Nazis were becoming an international problem
It came from Texas, in Dallas, I believe. I'm not sure if that's the answer you were looking for or not, but I hope it helped!
Maximian
They were then both given someone beneath them to make the tetrarchy