A “revolutionary struggle against the war” is merely an empty and meaning less exclamation, something at which the heroes of the Second International excel, unless it means revolutionary action against one’s own government even in wartime. One has only to do some thinking in order to understand this. Wartime revolutionary action against one’s own government indubitably means, not only desiring its defeat, but really facilitating such a defeat.
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A revolution in wartime means civil war; the conversion of a war between governments into a civil war is, on the one hand, facilitated by military reverses ("defeats") of governments; on the other hand, one cannot actually strive for such a conversion without thereby facilitating defeat.
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An understanding on revolutionary action even in a single country, to say nothing of a number of countries, can be achieved only by the force of the example of serious revolutionary action, by launching such action and developing it. However, such action cannot be launched without desiring the defeat of the government, and without contributing to such a defeat. The conversion of the imperialist war into a civil war cannot be “made”, any more than a revolution can be “made”. It develops out of a number of diverse phenomena, aspects, features, characteristics and consequences of the imperialist war. That development is impossible without a series of military reverses and defeats of governments that receive blows from their own oppressed classes.
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The war cannot but evoke among the masses the most turbulent sentiments, which upset the usual sluggish state of mass mentality. Revolutionary tactics are impossible if they are not adjusted to these new turbulent sentiments.