In the World War 2 movie “A Bridge too far” (1977) actor Anthony Hopkins played Lt. Colonel John Frost (1912-1993). The real Frost (pictured above) was present and gave Hopkins advice that he was running too fast battle scenes. Frost commented that he and other officers were actually moving slow to show the Germans -and his own soldiers- that they are not afraid of the enemy.
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Interview – Making of A Bridge too far
Top image is in Public Domain https://commons.wikimedia.org/wiki/File:John_Frost.jpg?uselang=en-gb#file