Independent Operational Group Silesia
Independent Operational Group Silesia (Polish: Samodzielna Grupa Operacyjna Śląsk, SGO Śląsk) was an Operational Group of the Polish Army, created in September 1938 to annex Zaolzie from Czechoslovakia.
The Group was commanded by General Władysław Bortnowski and comprised several Army units and five air squadrons. Altogether, 35,966 Polish officers and soldiers participated in the annexation of Zaolzie.
The Group comprised mostly units of the 4th Infantry Division, as well as regiments of the 14th Infantry Division, 15th Infantry Division, 16th Infantry Division, 23rd Infantry Division, 25th Infantry Division, and 21st Mountain Infantry Division. Additionally, a cavalry regiment was created, comprising units of the Wielkopolska Cavalry Brigade and the Pomeranian Cavalry Brigade.
- Marek Piotr Deszczyński, Ostatni egzamin. Wojsko Polskie wobec kryzysu czechosłowackiego 1938-1939 (The Final Exam: The Polish Armed Forces in the Czechoslovak Crisis of 1938–1939), Warsaw, 2003.
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