Question: The main character of The Pianist survives due to the help of a German army captain, who was taken prisoner by what army?

Context paragraphs:
Armenische Legion: The 812th Armenian Battalion (German: "Armenische Legion" ; Armenian: Հայկական լեգիոն "Haykakan legion"), also known as the Armenian Legion, was a military unit in the German Army during World War II.  It primarily consisted of Soviet Armenian, who had been taken prisoner by the Nazis, and commanded by General Drastamat Kanayan.

Wilm Hosenfeld: Wilhelm Adalbert Hosenfeld (] ; 2 May 1895 – 13 August 1952), originally a school teacher, was a German Army officer who by the end of the Second World War had risen to the rank of "Hauptmann" (Captain).  He helped to hide or rescue several Polish people, including Jews, in Nazi-occupied Poland, and helped Polish-Jewish pianist and composer Władysław Szpilman to survive, hidden, in the ruins of Warsaw during the last months of 1944, an act which was portrayed in the 2002 film The Pianist.  He was taken prisoner by the Red Army and died in Soviet captivity seven years later.

Alfred Minchin: Alfred Vivian Minchin was a British merchant seaman who was taken prisoner by a German destroyer after his ship, the SS Empire Ranger, one of a Murmansk convoy, was sunk by German bombers off Norway, and later a Sturmmann in the Waffen-SS "British Free Corps" during the Second World War.  He was taken prisoner on 28 March 1942.  It was he who suggested the name for the British Free Corps.  By 8 March 1945 he 'was being treated for scabies in the SS hospital at Lichtefelde-West.'  The National Archives holds the depositions for his trial at the Central Criminal Court under reference CRIM 1/485 and a Home Office file on him under reference HO 45/25817.  He was 'convicted at Central Criminal Court on 5 February 1946 of conspiring to assist the enemy and sentenced to 7 years penal servitude' for offences against the Defence Regulations.  He died in 2001 at the age of 81.

The Pianist (memoir): The Pianist is a memoir by the Polish-Jewish pianist and composer Władysław Szpilman in which he describes his life in Warsaw in occupied Poland during World War II.  After being forced with his family to live in the Warsaw ghetto, Szpilman manages to avoid deportation to the Treblinka extermination camp, and from his hiding places around the city witnesses the Warsaw ghetto uprising in 1943 and the Warsaw uprising (the rebellion by the Polish resistance) the following year.  He survives in the ruined city with the help of friends and strangers, including Wilm Hosenfeld, a German army captain who admires his piano playing.

Mikhail Meandrov: Mikhail Alekseyvich Meandrov (Russian: Михаил Алексеевич Меандров ) (October 22, 1894, Moscow - August 1, 1946, Moscow) was an Imperial Russian and later Soviet officer.  Taken prisoner by the Germans in World War II near Leningrad in 1941, he later became an important commander (general) in the Nazi-allied Russian Liberation Army.  Taken prisoner by the Soviets, he was executed in 1946.

Richard Stovin: Lieutenant-General Richard Stovin (died 1825) was a British Army officer during the late eighteenth and early nineteenth centuries.  He originally joined the army as an ensign in 1780, and saw service in the American War of Independence, where he may have been taken prisoner after the Battle of Yorktown.  After the outbreak of the French Revolutionary Wars, he saw service with a force sent to invade French colonies in the Caribbean, and was taken prisoner in 1794 at Guadeloupe.  Released after two years in captivity, he later commanded his regiment in the Netherlands, in the Helder Expedition of 1799, and on garrison duties in the Mediterranean and in India.  In the War of 1812 he was appointed to command a division in the forces in Canada, where an island in the St. Lawrence river was named after him.

Jagdstaffel 12: Royal Prussian Jagdstaffel 12 was a World War I "hunting group" (i.e., fighter squadron) of the "Luftstreitkräfte", the air arm of the Imperial German Army during World War I.  As one of the original German fighter squadrons, the unit would score 155 aerial victories (including three wins over observation balloons) during the war, at the expense of seventeen killed in action, eight wounded in action, and one taken prisoner of war.

Captain Willy Schultz: Captain Willy Schultz is a fictional comic-book soldier, a German-American U.S. Army captain during World War II, who after being falsely accused and convicted of murder, escapes and blends into the German Army while seeking a way to clear his name and retain his Allied allegiance.  Created by writer Will Franz and artist Sam Glanzman, the character starred in the feature "The Lonely War of Willy Schultz", which debuted in Charlton Comics' "Fightin' Army" #76 (cover-dated Oct. 1967).

Jagdstaffel 14: Royal Prussian Jagdstaffel 14 was a "hunting group" (i.e., fighter squadron) of the "Luftstreitkräfte", the air arm of the Imperial German Army during World War I.  As one of the original German fighter squadrons, the unit would score 57 aerial victories (including five wins over enemy observation balloons) during the war.  In turn, the "Jasta" paid a price of eight killed in action, five wounded in action, and three taken prisoner of war.

Jagdstaffel 32: Royal Bavarian Jagdstaffel 32, commonly abbreviated to Jasta 32, was a "hunting group" (i.e., fighter squadron) of the German "Luftstreitkräfte", the air arm of the Imperial German Army during World War I.  The unit would score 41 aerial victories during the war, including four enemy observation balloons.  In turn, they would suffer the expense of eight killed in action, five killed in flying accidents, four wounded in action, two injured in accidents, and one taken prisoner of war.

Supporting paragraphs: The Pianist (memoir) Wilm Hosenfeld
Answer: Red Army