well if anyone has half hour to listen about pervitine, here is link to timestamped video.
btw funny thing from this conversation
german army was high on meth, french army was drunk.
The British ran on copious amounts of tea. 
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Also, the Finns used Pervitin too.
Check out this guy:
japanese also used meth and british had just regular amphetamine.
but overall i find the story in OP interesting cause it explains beginnings of meth in nazi germany and how it impacted battle of france.