Oflag X - B Oflag X - B was a World War II German prisoner - of - war camp for officer s ( " Offizierlager " ) located in Nienburg am Weser , Lower Saxony , in north - western Germany . Adjacent to it was the enlisted men ' s camp ( " Stammlager " ) Stalag X - C . Camp history . Mudra - Kaserne . The " Mudra - Kaserne " ( " Mudra Barracks " ) , named after World War I General Bruno von Mudra , was completed in 1936 in what was then the outskirts of Nienburg . It was occupied by " Pionier - Bataillon 22 " of the " 22 . Infanterie - Division " until August 1939 , when the unit was deployed to the Siegfried Line on the borders of France as part of " 5 . Armee " . From September the Kaserne was used to temporarily house over 1 , 000 Polish officers captured during the September Campaign while Oflag X - B was being built immediately to the east . In March 1940 , before the camp was complete , the Polish officers were transferred to a sub - camp of Oflag X - A at Itzehoe in Schleswig - Holstein . Oflag X - B . Oflag X - B was opened in May 1940 , and was used to hold French officers captured during the battle of France . The camp was roughly square , about to each side . Internally , it was divided in half by a road running east - west , the " Ziegelkampstraße " . To the north of the road were seven prisoner accommodation blocks . Six were built of brick , while the seventh was wood . To the south were four more blocks ; three were for senior officers , while the fourth housed their " ordonnance " ( " orderlies " ) . The accommodation blocks were divided into rooms , each containing from 8 to 12 men . In the centre of the camp was camp kitchen and canteen . In the south - western corner of the camp , separated by a barbed - wire fence , were two hospital blocks , the shower / delousing block , and the detention block . The camp was enclosed by double barbed - wire fence , with rolls of barbed - wire in between . About inside the fence , a strand of electrified wire delimited " no man ' s land " which it was strictly forbidden to enter . Armed guards manned watchtowers at each corner , and at the centre of each side , of the camp . The administration buildings and accommodation blocks for the guards were located in a compound outside the main gate of the camp , west of the Oflag , and south of the Kaserne . The camp was commanded by an elderly " Oberst " , himself a former prisoner - of - war in Russia during World War I . The inhabitants of each block formed a " Kompagnie " , and had a German - speaking French officer appointed " block leader " to act as liaison between the POWs and the camp authorities . Generally , the French officers ran much of the camp themselves , organising the cooking of food , and the distribution of fuel , post , and supplies , and also staffed the hospital . Apart from a roll - call each day at 9 a . m . and 5 p . m , the prisoners were left to their own devices . They were encouraged to occupy their time in study or work , mending clothes and shoes . The prisoners performed plays and musical concerts , and open areas were used as vegetable gardens and to breed rabbits for food . In June 1941 thirteen officers managed to escape through a tunnel that they had dug from the easternmost hut out under the fence . Two managed to return home , while the others were soon captured . As a countermeasure , a deep trench was dug alongside the barbed - wire fence . On the evening of 4 February 1945 a British Lancaster bomber was hit by flak over Nienburg . The aircraft jettisoned its bombs , one of which hit the south - east corner of the camp . Three huts were destroyed , and 98 prisoners were killed , and many more injured . Stalag X - C . In mid - 1940 a camp for " sous - officiers " and " militaires du rang " ( NCOs and enlisted men ) , designated Stalag X - C , was opened directly to the north of the officers camp , separated from it by a road . The camp was only about a quarter of the size of the Oflag , and contained just six accommodation blocks , a kitchen , infirmary , post office , supply and detention blocks . Only the detention block was brick - built , with all the other buildings being wooden huts . Each block held between 160 - 200 POW . Initially Stalag X - C held only French soldiers , but later Poles , Belgians , Romanians and Serbs were sent there . In late 1943 , following the armistice , Italians arrived . There were also Soviet POWs , who were housed in the easternmost hut which was isolated from the others by an additional barbed - wire fence . Stalag X - C housed only about 1 , 000 prisoners , but there were up to 45 , 000 men in numerous " Arbeitskommando " scattered throughout the Weser - Ems region attached to it . These work details were assembled at the camps at Stalag X - B Sandbostel and Stalag X - D Wietzendorf , then sent to their place of work in agriculture or industry , before being handed over to the administration of Stalag X - C . Liberation . On 5 April 1945 all the fit officers and men were marched to Oflag 83 at Wietzendorf about to the north - east . The Nienburg camps were liberated by the British Army on 9 April . Post - war use . In the immediate post - war period Oflag X - B was used to accommodate displaced person s and refugees . It was taken over by the " Bundeswehr " in the 1950s and housed a military technical school . The southern half was eventually abandoned , and was later built over with housing . Six accommodation blocks and some smaller buildings of the northern half of the camp still survive . The administration compound was renamed the " Churchill Camp " and used as temporary accommodation until the 1960s . The site is now occupied by shops and office buildings . The buildings of Stalag X - C were demolished , and the site is now covered by woodland and a car - park . The " Mudra - Kaserne " was taken over by the British Army of the Rhine and renamed " Assaye Barracks " . It was the base of the 21st Regiment , Royal Engineers , from 1950 to 1996 , and also of the 24th Missile Regiment , Royal Artillery ( 1959 - 1962 ) ( operating the MGR - 1 Honest John nuclear surface - to - surface missile ) , and the 1st Armoured Division Transport Regiment , Royal Corps of Transport ( 1976 - 1978 ) . In 1996 the British left the Kaserne , and many of the buildings were demolished . It is currently the site of a hospital , police station , and sports grounds .