Certainly there is in Germany no one who would want to leave his fatherland defenceless against foreign attackers. That applies also to the Social Democratic Party, whose opponents ... have often accused it of lack of patriotism. .. we must for the present still reckon with the possibility of a war of aggression imposed from the outside, specifically from the east. ... If one day such a war were to break out ... it will be a world war which will set our fatherland before the question of "to be or not to be".
Now, if the victory of the Russians over Germany means the crushing of socialism in this country, what will be the duty of the German socialists with regard to this eventuality? Should they passively endure the events that are threatening them with extinction, abandon the post they have conquered and for which they are answerable to the world proletariat without putting up a fight? Obviously not. In the interest of the European revolution, they are obliged to defend all the positions that have been won, not to capitulate to the enemy from without any more than to the enemy within; and they cannot accomplish that except by fighting Russia and its allies, whoever they may be, to the bitter end. If the French republic placed itself at the service of His Majesty the Tsar, Autocrat of all the Russias, the German socialists would fight it with regret, but they would fight it all the same. The French republic may represent vis-à-vis the German empire the bourgeois revolution. But vis-à-vis the republic of the Constanses, the Rouviers and even the Clemenceaus, especially vis-à-vis the republic that is working for the Russian Tsar, German socialism represents the proletarian revolution. [Underline mine].