Short answers, pulled from the story.
The German commander Gerd von Rundstedt issued the order to freeze the armored spearhead on the 23rd of May 1940. This decision granted the British Expeditionary Force a reprieve that became the turning point of the early war.
The first day of the evacuation yielded only 7,669 men. This number seemed woefully inadequate given the scale of the disaster unfolding on the 26th of May 1940.
The evacuation effort was extended to the 4th of June 1940. On this date, another 26,175 Frenchmen were transported to England before the operation concluded.
The Luftwaffe lost 156 aircraft in operations during the nine days of Operation Dynamo. The Royal Air Force lost 145 aircraft, of which at least 42 were Spitfires.
The French First Army fought a delaying action against seven German divisions from the 28th to the 31st of May. The soldiers who surrendered were mostly from the 2nd Light Mechanized and the 68th Infantry Divisions.