Olgdenburg ? Never heard that name before, the correct Finnish name would be Nevanlinna translated to russian as Ниенша́нц and to english as Nyenschantz.
Nyenschantz was a small fortress located west of the st. Petersburg before russians started building st. Petersburg.
Nevanlinna was also proposed as a new name for Leningrad if Germans would have given it to Finland in the possible German major victory.
More info about the actual fortress of Nevanlinna
http://en.wikipedia.org/wiki/Nyenschantz
On topic
Are there going to be anymore battle pictures from Blitzkrieg game? They really enhanced the experience.