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In page Psychological warfare:

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Germany's Fall Grün plan of invasion of Czechoslovakia had a large part dealing with psychological warfare aimed both at the Czechoslovak civilians and government as well as, crucially, at Czechoslovakia's allies.[1] It became successful to the point that Germany gained the acquiescence of the British and French governments to the German occupation of Czechoslovakia without having to fight an all-out war, sustaining only minimum losses in covert war before the Munich Agreement.[citation needed]