Actually, Article 231 of the Treaty of Versailles read:
The Allied and Associated Governments affirm, and Germany accepts, the responsibility of Germany and her allies for causing all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by the aggression of Germany and her allies.'
This was not completely true, of course, as there was plenty of guilt to share on both sides. The Allies relied on this clause to impose harsh reparation demands on Germany, so high that the entire amount was seven times the entire net worth of Germany. The French even calculated the possible pension of the youngest soldier who fought in the war and added that to the tab. It was this clause, and the reparations which followed, which gave Hitler a platform to attack the Treaty as unfair to Germany--which it was, in reality.