The background of the story is set in World War I, when Germany was defeated. After Hitler came to power, he reorganized his armaments at a very fast speed and took Poland as the primary attack target. Although Poland was promised by Britain and France to maintain the integrity of Poland s territory, the German army entered Poland smoothly due to the concession after the negotiations between Germany and the Soviet Union. The territory, and won a lightning-fast victory, and later historians have dubbed it a successful example of "blitzkrieg". —description from the publisher (translated)

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