Guderian attributed much of the early German success to the "operational" level of planning between tactical and strategic which only existed informally in other armed forces.
Also bear in mind that Adolf Hitler's tendency to favor and encourage bold unusual and slightly risky ideas and plans (capturing the massive Belgian fortress Eben-Emael by landing gliders on top of it for example) worked against the Germans later in the war when caution was advised but it was usually to their benefit in these early years.
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