Stalag XXI-D was a German World War II PoW Camp based in Poznań (Posnan), Poland.
Following the invasion of Poland in 1939 and the establishment of the Reichsgau Wartheland, Poznań became the administrative centre of 'Wehrkreis XXI' (Military District XXI). Some of Poznań's eighteenth century forts were used as prison camps. Most notorious of these was the concentration camp, Fort VII, which was predominately used to house Polish prisoners.
Some other forts, along with labour camp locations in the surrounding countryside, were used to hold PoWs. These collectively formed Stalag XXI-D and accommodated just over 3000 prisoners in total.
In Poznań itself, three forts were used to house PoWs; Rauch, IIIA and VIII.
On the eastern, right, bank of the River Warta, near to the present day St. Roch bridge, stood Fort Rauch, the most southern of the right bank fortifications. Although partially demolished during the 1920s, it was used to accommodate about 750 men. An ICRC report of August 1941 described the fort as being "a circular building, made of red brick with three floors each with its windows facing an interior court which acts as the hub of the fort. There is no overcrowding and the rooms are not so large that they become noisy when filled with prisoners." Prisoners lived in many of the 50 basement rooms of the brick built redoubt, with 30-46 beds per room. Other rooms were used as a common room and theatre. After the war Fort Rauch was completely demolished and a college now stands on the site.
52°24′7.20″N 16°57′3.60″E / 52.4020000°N 16.9510000°E