After careful consideration I have decided to continue my analysis of Sundberg's dissertation Swedish defensive fortress warfare in the Great Northern War : 1702-1710. I will continue with the sources and the literature.
Case 1: Menzen 1702
As Menzen was an ordinary manor it's not even obvious why it has been included in the study. Surely it was neither built nor manned as part of a defensive system established in Livonia?
As for the appearance and size of Menzen Sundberg has basically nothing to say and is forced to use a drawing of an entirely different manor. Could he have improved on this by using Baltic archives? I would think that's very likely. A simple google search turned up an excavation report from 2008 with a contemporary map showing the manor close to a small lake (which is not mentioned by Sundberg).
Sundberg then goes on to speak about sources and previous research. He mentions a couple of brief late 19th century works by Otto Sjögren, who primarily worked on the Schlippenbach archive which more or less by chance had ended up in Stockholm. Sundberg also notes the so called diary of Czar Peter and a mysterious report mentioned by Adam Lewenhaupt's Karl XII:s officerare.
Is this really all there is of previous research? Obviously not. What first comes to mind is Carl von Rosen's Bidrag..., published in the 1930's. The second volume deals with the war in Courland, Livonia and Ingria during the first few years and Rosen mentions Menzen. Another even more obvious work is Heldur Palli's Mezjdu dvumja bojami za Narvu (1966), which would have given Sundberg an idea of what Baltic archives hold.
Sundberg notes that a letter from the Swedish commander is incorrectly dated and how this mistake through Sjögren has found its way into other works. If Sundberg had used Rosen or Palli he would have found chronologically more accurate versions, so it could be argued that his ability to correct the record is solely based on the fact that he has failed to use certain previous works.
An additional note:
Just before Sundberg starts the discussion of various sieges during the GNW he lists on page 131 the strength of Swedish garrisons in 1699. In footnote 425 he has a long explanation of a presumed problem concerning the exact date Carl Gustaf Frölich was put in charge of Soop's regiment. The solution is very simple. If Sundberg had looked in Riksregistraturet (available online) he would have found that Frölich was appointed on 10 March 1700 (not 1701) because Soop had died and that the appointment was for both the governorship and the regiment. So the footnote is quite unnecessary - everything is quite clear if one uses the logical sources.
To be continued...