And so the irrepressible conflict broke out. It had to come, a conflict between conservatism and progress, between race prejudice and brotherhood, between superstition and Christianity, the tremendous conflict of ages which every nation has had to fight, and which in China was not different in kind, but only on a more colossal scale because there it involved half the human race at once. Of course it was impossible for so vast a nation permanently to segregate itself. The river of progress cannot be permanently stayed. It will gather force behind an obstacle until it is able to sweep it away. The Boxer uprising was the breaking up of this fossilized conservatism. It was such a tumultuous upheaval as the crusades caused in breaking up the stagnation of mediaeval Europe. As France opposed the new ideas, which in England were quietly accepted, only to have them surge over her in the frightful flood of the revolution, so China entered with the violence always inseparable from resistance the transition which Japan welcomed with a more open mind. Though missionaries were not the real cause of the Boxer uprising, its horrors fell most heavily upon them. This was partly because many of them were living at exposed points in the interior while most other foreigners were assembled in the treaty ports where they were better protected; partly because the movement developed such hysterical frenzy that it attacked with blind, unreasoning fury every available foreigner, and partly because in most places the actual killing and pillaging were not done by the people who best knew the missionaries but by mobs from the slums, ruffians from other villages, or, as in Paoting-fu and Shan-si, in obedience to the direct orders of bigoted officials.