Indeed, urgh! These battles outside Dunkirk have been forgotten when actually they form a number of battles keeping strong German formations out of Dunkirk. It´s just that not until lately have I found any evidence of these battles. These battles were very important and many men gave their lives in order to make the miracle of Dunkirk happen!
I have a great series of magazine articles on Calais if you would like a copy. Im glad Dunkirk happened... My grandfather was on those beaches.
I would call it a big mistake by the allies getting beaten back to the coast and a big mistake for the Germans not wiping the army out.