Thanks for this interesting historical tidbit. I very much enjoy reading such articles. With their detail, they give the broad historical accounts a human face.

I also enjoyed this article but I must admit that my knowledge of Estonian geography almost non-existent and, therefore, some detail on the locations of the places referred to would have been beneficial. All the same, It's a good read.

Estonia is not a very big place. If you are interested then punch in the names of "Tartu" and "Valga" using any search engine. Wikipedia has good write ups on both including a map. Puurman is a very small place just to the south of Tartu but you need a really detailed map of Estonia to find it.
Nice to see that someone not familiar with Estonian geography found the article interesting.