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In page Strategic bombing:

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Strategic bombing in Europe never reached the decisive completeness the American campaign against Japan achieved, helped in part by the fragility of Japanese housing, which was particularly vulnerable to firebombing through the use of incendiary devices. The destruction of German infrastructure became apparent, but the Allied campaign against Germany only really succeeded when the Allies began targeting oil refineries and transportation in the last year of the war. At the same time, the strategic bombing of Germany was used as a morale booster for the Allies in the period before the land war resumed in Western Europe in June 1944.[citation needed]