Very interesting Courtois
Some observations
According to Johannes Mathews Wagner only made two claims in the Bryansk area on 24
April (not March as given)
From where comes the third claim (time 04.47H)?
Since I am completely non Russian speaking/reading (it's all Greek to me

), the names you list and point
me towards both come up very differently when Mr Google translated them:
Sokolsky, Alexey Nikitich and Avetyan, Vartan Khachaturovich.
Can you or anyone else comment on that please?
Cheers
Stig