It’s complicated. He was 48 when the Great War started so too old to participate, but he had been a pacifist until then. On the outbreak of war, he kind of swung a bit the other way while still calling himself a pacifist, arguing that it was appropriate to fight the aggressors. Then he wrote Things to Come with its vision of a world destroyed, or nearly so, by war, at around the same time as he was predicting the Second World War.
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