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The blitzkrieg, in short, had been perfected for a sleek, hard-muscled, superbly trained, and passionately motivated army, such as the German General Staff had fashioned during the decades between the wars. It was quite unsuited for a ponderous, top-heavy army of ill-trained soldiers led by timid officers, overseen by inexperienced party ideologues, and sent forth to conquer a country whose terrain consists of practically nothing but natural obstacles to military operations.
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William R. Trotter (A Frozen Hell: The Russo-Finnish Winter War of 1939-1940)