There is nothing extraordinary about an evacuation. As much is admitted by Churchill himself. I point you to Churchill's autobiography set, particularly the "Our Finest Hour" edition. I would much rather have an adventure about the assassination of Reyhnard Heydrich or a biopic of Otto Skorzeny, but I bet you don't know anything about those stories. Careful about calling someone ignorant about something when they have written on it.
Dunkirk is a miracle in that Hitler for the first time listened to Goering and his overestimates regarding the capabilities of the Luftwaffe. That in and of itself is the true value of Dunkirk, not the rescue of ~340,000 men, because it would ultimately doom Hitler in the Soviet Union and at home by 44/45. The value of those 340,000 men later in the war I concede, however, is a point argued by many.
IMHO it's just wrong to assess the loss of 340,000 soldiers killed or captured at Dunkirk at the end of May 1940 as less than game changing. Sure, German air superiority was not established, but 340,000 soldiers is greater than Britian's total loss of soldiers of 326,000 in ALL of the war.
Winston Churchill on June 18, 1940 a little over 2 weeks later stated "The Battle of France is over. I expect the Battle of Britain is about to begin." It was. The defeat of the Lufftwaffe by the RAF, and hence, stopping Hitler's attempt to conquer Britian, surely was aided by manpower which would not have been available had the Dunkirk evacuation failed.
In 1940, Roosevelt was still assuring Americans we would not be "sending our sons" overseas. He was on the verge of the Lend/Lease program to supply nations in defense of Democracy, and having American's escort the ships carrying these supplies. The American Congress was greatly opposed to entering the war, and many opposed the Lend/Lease, as they felt it would so antagonize Hitler he would declare war on America.
So, over a year later Japan attacks Pearl Harbor on Dec 7, 1941 in the Pacific; and Hitler declared war on the US just days later.
America had to build, train, and deploy an army to fight on TWO fronts, a world apart. Even the suggestion of building military might had been vigorously opposed before Pearl. So it was in November of 1942, eleven months after Pearl, that Operation Torch, the invasion of North Africa, became the very first US military ground offensive of WW2 against Germany. Eleven months after Hitler declared war on the United States.
Approximately two years and five months AFTER Dunkirk.
If Germany had cut off those British troops at Dunkirk from the sea at the end of May 1940 it's likely Britian would have been defeated and occupied.
This would deny the US and the Allies the capability to build airfields in Britian which served as the ONLY POSSIBLE location for the brand new American air power to bring destruction on Nazi Germany.
It would have made supplying the Allies in the northern European Theater orders of magnitude more difficult. It would have denied the Allies a mustering location and a landing across the channel at Normandy on D-Day, June 6, 1944 Four years after Dunkirk.
I'm not saying the Nazi's would not have been defeated. Russia gave more blood than is imaginable to stop them with 10,000,000 soldiers and 10,000,000 civilian casualties. That was also with Allied supplies, however limited. But the world would be totally different without the Dunkirk Evacuation and a free Britiania throughout the whole of WW2.
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General? Reyhnard Heydrich was the head of the holocaust death camps.
Lt. Col. Otto Skorzeny did not appear on the world stage until 1943 when he grabbed Benito Mussolini from his prison on the highest peak in the Appenines; so becoming "The Most Dangerous Man in Europe".
While these two are somewhat interesting. Many holocaust movies exist. Skorzeny's feat would make (or was even the plot source) for a war thriller on the order of "Where Eagles Dare".