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.
Field Marshal Herbert Charles Onslow Plumer, 1st Viscount Plumer, {'1': ", '2': ", '3': ", '4': "} (13 March 1857 – 16 July 1932) was a senior British Army officer of the First World War.
 After commanding V Corps at the Second Battle of Ypres in April 1915, he took command of the Second Army in May 1915 and in June 1917 won an overwhelming victory over the German Army at the Battle of Messines, which started with the simultaneous explosion of a series of mines placed by the Royal Engineers' tunnelling companies beneath German lines, which created 19 large craters and was described as the "loudest explosion in human history".
 He later served as Commander-in-Chief of the British Army of the Rhine and then as Governor of Malta before becoming High Commissioner of the British Mandate for Palestine in 1925 and retiring in 1928.
Artur Gustav Martin Phleps (29 November 1881 – 21 September 1944) was an Austro-Hungarian, Romanian and German army officer who held the rank of "SS-Obergruppenführer und General der Waffen-SS" (lieutenant general) in the "Waffen-SS" during World War II.
 An Austro-Hungarian Army officer before and during World War I, he specialised in mountain warfare and logistics, and had been promoted to "Oberstleutnant" (lieutenant colonel) by the end of the war.
 During the interwar period he joined the Romanian Army, reaching the rank of "General-locotenent" (major general), and also became an adviser to King Carol.
 After he spoke out against the government, he was sidelined and asked to be dismissed from the army.
Adolf Wilhelm Bernhard von Brauchitsch (7 November 1876 – 21 January 1935) was a decorated German army officer with the rank of major general.
 A very experienced officer, he worked with the Army High Command under Hans von Seeckt and in the Ministry of the Reichswehr, before retiring in 1929 due to failing health.
Erich Hampe (17 December 1889 – 28 June 1978) was a German Army officer with the rank of Generalmajor, who served as Chief of the Department for Technical Troops in OKH during World War II.
 Previously he was Vice Chief of the Technische Nothilfe as well as an editor and the author of the official history of German civil defense during the second World War.
 During the postwar years, he served as the first president of the Federal Agency for Civil Defense ("Bundesanstalt für zivilen Luftschutz").
Rudolf Toussaint (2 May 1891 – 1 July 1968) was a German Army officer.
 Toussaint saw action in both World Wars, while during World War II he was appointed Commissioner of the German army in the office of the Reich Protector of Bohemia and Moravia ("Wehrmachtsbevollmächtigte beim Reichsprotektor in Böhmen und Mähren").
Major-General Kurt Wahle (26 December 1855 – 19 June 1928) was a Saxon-born retired German army officer who travelled to German East Africa in 1914 to visit his son.
 At the outbreak of World War I, he re-enlisted in the German Army in the colony, becoming one of Colonel Paul von Lettow-Vorbeck's field commanders.
 He was involved in the fighting during the East African Campaign until October 1918.
 During the Campaign, he was awarded the Iron Cross (First Class), and the "Pour le Mérite" and commanded the German force at the Battle of Tabora.
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.
Friedrich Fromm (8 October 1888 – 12 March 1945) was a German army officer.
 In World War II, Fromm was Commander in Chief of the Reserve Army ("Ersatzheer"), in charge of training and personnel replacement for combat divisions of the German Army, a position he occupied for most of the war.
 A recipient of the Knight's Cross of the Iron Cross, he was executed for failing to act against the plot of 20 July 1944 to assassinate Hitler.
Generalleutnant Viktor Leopold Linnarz (19 August 1894 – 14 October 1979) was a German army officer who served in the Prussian Army in World War I and the German Army during World War II.

Question: The Pianist is a memoir in which the author survives with the help of which German Army officer?
Answer: Wilhelm Adalbert Hosenfeld