1920 04 I think I can provide some pieces of information about the second Silesian Uprising.
The main goal of the Uprising was to get rid of the German Selbstschutz. In Upper Silesia, the Selbstschutz militia attacked Poles and Silesian activists that were in favour of joining Silesia to Poland, the headquarters of Polish-language newspapers and persecuting local population.
The cruelty of so-called “Sipo” raised tensions and lead to public demonstrations in Bytom, Gliwice, Katowice, Chorzów, Mysłowice, Pszczyna, Radzionków, Ruda, Rybnik, Wirku, Wodzisław, Zaborze and Zabrze on April 25, 1920. Protesters were demanding a delegalization and dissolution of the Selbstschutz
Germans answered by attacking Poles during the celebrations of the anniversary of the Third May Constitution.The tensions only continued to rise, as the polish children began a strike. The youth demanded equality for the Polish language in schools in Upper Silesia.
Between 27-28 May German militias attacked the Polish Plebiscite Commission located in the Lomnitz Hotel in Bytom. The poviat venues of the Polish Plebiscite Committees were demolished in few cities.
Later that year, on August 17 German newspapers spread false news about the fall of Warsaw to the Red Army. In reaction to this news, German militias in Katowice (Kattowitz) attacked the seat of the district inspector of the Inter-allied Commission - Colonel Blanchard. French soldiers were forced to use force, killing 10 attackers. In retaliation well-known Polish doctor Dr Andrzej Mielecki, who provided wounded was lynched. Then the Germans moved on to demolish the seat of the Polish plebiscite committee in Katowice located in “Deutsches Haus” hotel.
The uprising started during the night of 19/20 September 1920. It was proclaimed by Wojciech Konfratry, a leader of the Polish community in Upper Silesia. In the same time, Polish workers in a sign of support started a general strike.
The Uprising was coordinated by “Polska Organizacja Wojskowa Górnego Śląska” - Polish Military Organization of Upper Silesia with Alfons “Rakoczy” Zgrzebniok as it’s komendant (commander). His first order was to immediately destroy communication networks in order to order to prevent the quick reaction from German forces. This operation was a total success.
The overall strategy of the insurgents formulated by PMOofUS was to launch attacks in the countryside and small towns and to leave the larger towns as they were protected by allied garrisons. Still, insurgent forces would still try to inflict panic among the Germans living in the larger cities by waging skirmishes near them.
But back to the fighting:
Between 20 and 21 August 1920 more than two thousand insurgents under the command of lieutenant Stanisław Krzyżowski, has taken over the entire Pszczyna (Pless) poviat (with exception of Pszczyna itself because of the reasons I mentioned above)
During the following days, insurgents took over large parts of Upper Silesia including many towns. (I can post a more detailed list of towns as well as more details about the fights if you want)
On August 24 Inter-governmental and Plebiscite Commission for Upper Silesia ordered to dissolve the German Sicherheitspolizei. With this information, Polish command decided that the insurgent actions should be ended, which took place day after on August 25th.
After the uprising, the Commision introduced in place of the German police, mixed Polish-German units called Abstimmungspolizei. Commission also promised to punish German militias for attacking Poles. In return Polish side officially disbanded the Polish Military Organization of Upper Silesia which in reality continued to exist under a new name “Headquarters of Physical Education”.
Overall the Uprising was a big success.
If you want any specific information (what I have posted here is a very streamlined depition of the II Urpising) let me know.
Here are sources I used:
T. Jędruszczak, Górny Śląsk w 1920 r. Drugie powstanie Śląskie (Upper Silesia during 1920, Second Silesian Uprising)
Encyklopedia Powstań Śląskich Opole 1982 (Encyclopedia of Silesian Uprisings)