This is just an excerpt from Mein Kampf. If we pass all the causes of the German collapse in review, the ultimate and most decisive remains the failure to recognize the racial problem, and especially the Jewish menace. The defeats on the battlefield in August 1918, so he's referring to the end of World War I, would have been child's play to bear. They stood in no proportion to the victories of our people. It was not they that caused our downfall. No, it was brought about by that power which prepared these defeats by systematically over many decades robbing our people of the political and moral instincts and forces which alone make nations capable and hence worthy of existence. He's blaming Germany's defeat in World War I on a relatively small ethnic group.