..It seems that, first of all, the German revolution that overthrew the original government to install a parliament was the first step. This nature and cause of this revolt is highly suspect. We understand that the Russians, just a year earlier, were forced to surrender after western-backed (Banker-backed,) Bolsheviks overthrew their own country. It is reasonable to assume that the same powers employed the same methods in Germany.
But here we learn that, even after that revolution, the German army out-numbered entente on the western front as was on the winning side of a stalemate -- especially considering the recent surrender of Russia on Germany's eastern front. Securing the eastern front would, presumably, bolster the western substantially.
HOWEVER, the US enters the war. This forces the German Army to charge the front before the American's arrive, but consequently lose the push. Soon after, 1-2 million American soldiers would arrive.
So there you have it. The Entente only won because the International Bankers were primarily English and American, and pushed the US into the war.