Admiral B.H. Ramsay gathered every available transport under Operation Dynamo.  
Two key thrusts that gained time for it included the sending of reinforcements to aid King Leopold and a tank attack at Arras.  Roughly 200,000 Germans from the Fourth and Eighteenth Armies were led by Generals Gerd von Rundstedt and Fedor von Bock, while Field Marshal Lord Gort led the BEF and its French and Belgian allies. Admiral B.H. Ramsay gathered every available transport under Operation Dynamo.  For 10 points - name this May 1940 military operation in which Nazi hesitation allowed Allied forces to escape the namesake French town for Britain.
Two key thrusts that gained time for it included the sending of reinforcements to aid King Leopold and a tank attack at Arras.  
Dunkirk