Continuing from Sconibulus' cipher...
I think the numbers correspond to
the nth digit in the MMDDYYYY date of the listed events:
JapanInvadesChina - (1) - 07071937
FormalEndingOfTheWar - (8) - 09021945
PearlHarborBombed - (5) - 12071941
SouthernFranceBecomesVichy - (7) - 07101940
CzechoslovakiaCedesSudetenland - (3) - 04241938
AlliesFreeParis - (1) - 08251944
GermanyInvadesPoland - (5) - 09011939
MussoliniFalls - (7) - 07251943
This gives
05142014
What happened on this date?
A lot of stuff, but nothing that jumps out as the right answer.
en.wikipedia.org/wiki/Portal:Current_events/2014_May_14
The only connection to WWII is the 56th anniversary of the founding of the state of Israel.