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Lets say that of the class of 1913 (see below) of the 1,328,019 men available for service they add another 200,000 men to be called up, or 505,000, vs the 305,000 they did call up. This would still leave 500,000 uncalled men for service vs the 700,000 that were left off the rolls.
Now in the Shlef plan your 9th army sweeps Lille to Amiens to Rouen and Caen.

1. Does the BEF withdraw in front of these forces to Caen and then to Britain?
2. Does it stay in the battle and fight the B of Marne and risk being cut off ?

I would say withdrawal and not be available for the B of Marne.

If so does France lose the B of Marne and lose or hold the Germans at Paris? I feel however in the long run this extra lost territory would be fatal to the Allies?


http://www.greatwar.com/scripts/openExtra.asp?extra=10
A typical 1913 Army class, of which 305,000 had
been required (a figure increased by the German "Peace Strength
Law of 1912" to be effective by October 1915 even if war had not
broken out) is listed as:

20 year olds: 587,888
21 year olds: 380,331
22 year olds: 305,619
older & younger 54,181

Total 1,328,019

Of this lot, 118,300 were posted to the Landsturm, 86,911 to the
Ersatz Reserve, and only 305,675 to the ACTIVE units(or about 1/4
of those in the class). The remaining 700,000+ not included in
these figures were "put back" for any reason imaginable.(called
"Restanten"), and were not required to serve ONLY in peacetime.
Rejected men, which ran no more than 5 or 6 per cent, were liable
for no service. These again could be reexamined should war be
declared. Ersatz Reserve men were usually those who were fit for
duty but were excused for economical or minor physical defects.
This group would comprise those who would fill the ranks quickly
in time of war.
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