In the first three parts of our series on the German Revolution of 1918-19 we showed how, after the collapse of the Socialist International faced with World War I, the tide turned in favour of the proletariat, culminating in the November Revolution of 1918, which, like the October Revolution in Russia the previous year, was the high point of an uprising against the imperialist war. Whereas October represented the first mighty blow of the working class against the "Great War", it was the action of the German proletariat which finally brought it to an end.