Some data points of interest in a time of a biblical struggle between Britain and Germany. 

DUNKIRK Diary

23-May-40 THU   King George requested following Sunday be observed as National Day of Prayer
24-May-40 FRI     Wehrmacht stops advance outside Dunkirk
25-May-40 SAT     
26-May-40 SUN    National Day of Prayer. 
27-May-40 MON  Operation Dynamo 7669 rescued 
28-May-40 TUE    Operation Dynamo 17804 rescued
29-May-40 WED   Operation Dynamo 47310 rescued
30-May-40 THU    Operation Dynamo 53823 rescued
31-May-40 FRI      Operation Dynamo 68014 rescued
01-Jun-40 SAT      Operation Dynamo 64429 rescued
02-Jun-40 SUN     Operation Dynamo 26256 rescued
03-Jun-40 MON    Operation Dynamo 26746 rescued
04-Jun-40 TUE      Operation Dynamo 26175 rescued 

Over 9 days  338,226 rescued (98,671 from Beaches, 239,555 from Harbour) 

Spitfire trivia
The spitfire entered service on 4 August 1938 (19 Squadron, RAF Duxford). At the start of the Battle of Britain the RAF had in total 749 fighters, of which less than 300 were Spitfires. 

A giant purpose built factory was built to manufacture Spitfires at Castle Bromwich, Birmingham. Construction begun in 1938 and the original schedule was for a production of 240 per month starting in April 1940, but by May 1940, zero had been completed (stressed-skin construction required precision engineering skills and techniques beyond capabilities of local labour). In June 1940 only 10 were built, in September only 56 but production eventually reached 320 per month, ending in June 1945 when a total of 12,129 had been built at Castle Bromwich.  (20,334 Spitfires were built in Total) 

High speed diving trials used the Spitfire because it had the highest limiting Mach number of any contemporary aircraft. Testing a Spitfire In April 1944, Squadron Leader Anthony F. Martindale, dived to Mach 0.92 (the fastest ever recorded in a piston-engined aircraft). The propeller and reduction gear broke off and the Spitfire, now tail-heavy, zoom-climbed causing Martindale to black out under an 11g loading. When he resumed consciousness, he found the aircraft at about 40,000 feet with its (originally straight) wings now slightly swept back. He successfully glided the Spitfire 20 miles back to his airfield. Martindale was subsequently awarded the Air Force Cross. As of 2020, some 70 Spitfires are still airworthy (along with 12 Hurricanes.) 

Battle of Britain

Jun - Sep 1940            Pilots       KIA
RAF                                 1822         339
Fleet Air Arm                     56            9
Australia                             21         14
NZ                                       73          11
Canada                              88          20
South Africa                      21            9
Rhodesia                             2             0
Irish                                      8            0
USA                                      7             1
Poland                            141           29
Czechoslovakia               86             8
Belgium                            26            6
France                              13             0
Israel                                  1             0 
Total                            2365     446

Info 2

Winston Churchill speeches 
13-May-40 MON  "Blood, toil, tears and sweat"
04-Jun-40 TUE    "We shall fight on the beaches"
18-Jun-40 TUE     (start of Battle of Britain): "This was their finest hour"