is also considered one of the few Polish generals of the September 1939 campaign to have not been defeated in battle (along with Gen. Maczek). Not all of the Polesie Group soldiers capitulated; many dispersed and continued guerrilla warfare, most notably major Henryk Dobrzański and his Detached Unit of the Polish Army, which is credited with being the first Polish partisan unit and was active until the spring of 1940. Organization The SGO was commanded by general Franciszek Kleeberg, his chief of staff was colonel M. Łapicki. Kleeberg was tasked with organizing his group from various small units in the Polesie region; most of them were either reserve and mobilizing or second line such as the National Defense units; the notable exception were the elite Border Protection Corps (KOP) units and the Riverine Flotilla of the Polish Navy. On 14 September, when the group was engaged by German forces, it was composed of: "Kobryń Group" (seven infantry battalions) - under col. Adam Epler "Brześć Group" (five infantry battalions, two light tank companies, two armored trains under gen. Konstanty Plisowski "Drohiczyn Poleski Group" (three infantry battalions) - under col. Kazimierz Gorzkowski "Jasiołda Group" (one infantry battalion) - under mjr Ludwik Rau Riverine Flotilla of the Polish Navy Over the next two weeks the group sustained casualties but it was also reinforced by various units from the disintegrating Polish army, including defenders of the Sarny Fortified Area. The total strength of the SGO was 18,000 soldiers. On 29 September, after reorganization, the group was composed of: Polish 50th Infantry Division (reserve, later nicknamed "Brzoza" after its commander) under col. Ottokar Brzoza-Brzezina Polish 60th Infantry Division (reserve, later nicknamed "Kobryń") under col. Adam Epler Improvised Cavalry Division "Zaza" (pl) (improvised, nicknamed "Zaza") under gen. Zygmunt Podhorski (mostly based on Podlaska Cavalry Brigade and Suwalska Cavalry Brigade from Independent Operational Group Narew) Notes a Stanisław Maczek, another Polish commander with the reputation of being undefeated, was promoted from colonel to general in November 1939 after his 10. Cavalry Brigade AKA "Die Schwarze Brigade" – "The Black Brigade", a fully motorized and mechanized unit, outperformed any other such unit (including tank brigades) in the Polish military. The unit was recreated in France in 1940 and fought in 1944 and 1945 alongside the British (Polish Armed Forces in the West). References Inline: General: Armie i samodzielne grupy operacyjne Wojska Polskiego 1939 WIEM Encyklopedia Inne związki operacyjne