Question: What true story did a World War II film that Anthony Andrews star in that was the only successful assassination of a senior Nazi leader during World War II?
Context: HHhH (in some markets titled The Man with the Iron Heart) is a French biographical war thriller drama film directed by Cédric Jimenez and written by David Farr, Audrey Diwan, and Jimenez.  It is based on French writer Laurent Binet's novel "HHhH", and focuses on "Operation Anthropoid", the assassination of Nazi leader Reinhard Heydrich in Prague during World War II. King Rat is a 1965 World War II film directed by Bryan Forbes, and starring George Segal as Corporal King and James Fox as Marlowe, two World War II prisoners of war in a squalid camp near Singapore.  Among the supporting cast were John Mills and Tom Courtenay.  The film was adapted from James Clavell's novel "King Rat" (1962), which in turn is partly based on Clavell's experiences as a POW at Changi Prison during the Second World War. Fritz Todt (4 September 1891 – 8 February 1942) was a German construction engineer, senior Nazi figure, who rose from "Inspector General for German Roadways" where he oversaw the construction of German Autobahnen ("Reichsautobahnen") to Reich Minister for Armaments and Ammunition where he led the entire war military economy.  At the beginning of World War II he founded what Hitler named "Organisation Todt" a military engineering company which supplied industry with forced labor and administered all constructions of concentration camps in the late phase of the Third Reich.  He died in a plane crash in 1942. Operation Daybreak (also known as The Price of Freedom in the US) is a 1975 Second World War film based on the true story of Operation Anthropoid, the assassination of SS General Reinhard Heydrich in Prague.  Starring Anthony Andrews, Timothy Bottoms and Martin Shaw, it was directed by Lewis Gilbert and shot mostly on location in Prague.  It is adapted from the book "Seven Men at Daybreak" by Alan Burgess. Hitler's Madman is a 1943 World War II film about the assassination of Nazi Reinhard Heydrich and the Lidice massacre revenge taken by the Germans.  The picture was produced by Seymour Nebenzal for PRC and Angelus Pictures, Inc.  It starred Patricia Morison and featured John Carradine as Heydrich. The propaganda of the National Socialist German Workers' Party regime that governed Germany from 1933 to 1945 promoted Nazi ideology by demonizing the enemies of the Nazi Party, notably Jews and communists, but also capitalists and intellectuals.  It promoted the values asserted by the Nazis, including heroic death, "Führerprinzip" (leader principle), "Volksgemeinschaft" (people's community), "Blut und Boden" (blood and soil) and pride in the Germanic "Herrenvolk" (master race).  Propaganda was also used to maintain the cult of personality around Nazi leader Adolf Hitler, and to promote campaigns for eugenics and the annexation of German-speaking areas.  After the outbreak of World War II, Nazi propaganda vilified Germany's enemies, notably the United Kingdom, the Soviet Union and the United States, and in 1943 exhorted the population to total war. HHhH is the debut novel of French author Laurent Binet, released in 2010 by Grasset & Fasquelle.  The novel recounts Operation Anthropoid, the assassination of Nazi leader Reinhard Heydrich in Prague during World War II.  The novel was awarded the 2010 Prix Goncourt du Premier Roman. Kurt Wilhelm Albert Karl Agricola (15 August 1889 – 27 December 1955) was a general in the Wehrmacht of Nazi Germany during World War II who held senior level occupational rear-security commands in the occupied Soviet Union.  A native of Saxony, Agricola entered army service in 1908 and served during World War I.  During the interwar era, he held staff assignments and continued to rise through the army's ranks in the Wehrmacht of Nazi Germany.  His career ended stalled in January 1939, when he was sent into retirement on political grounds because of his marriage to Martha born Hahn, a Jewish woman.  Reactivated again upon the start of World War II, Agricola received exclusively positions behind the front line.  As rear area commander of the 2nd Army in the occupied Soviet union during 1941–43, Agricola brought changes in the Wehrmacht's harsh occupation policies and was successful in maintaining control of his area of occupied territory from Soviet partisans.  Shortly after the war's end, he was arrested by Soviet authorities, convicted of war crimes and remained in captivity for a decade.  One of the last German prisoners in the Soviet Union, he was released in October 1955 and died shortly thereafter in West Germany. The title of SS and police leader (German: "SS- und Polizeiführer" ) was used to designate a senior Nazi official who commanded large units of the SS, Gestapo and the German uniformed police ("Ordnungspolizei"), prior to and during World War II. Operation Anthropoid was the code name for the assassination of Schutzstaffel (SS)-"Obergruppenführer" and "General der Polizei" Reinhard Heydrich, head of the "Reichssicherheitshauptamt" (Reich Main Security Office, RSHA), the combined security services of Nazi Germany, and acting "Reichsprotektor" of the Protectorate of Bohemia and Moravia.  The operation was carried out in Prague on 27 May 1942 after having been prepared by the British Special Operations Executive with the approval of the Czechoslovak government-in-exile.  Wounded in the attack, Heydrich died of his injuries on 4 June 1942.  His death led to a wave of merciless reprisals by German SS troops, including the destruction of villages and the killing of civilians.  Anthropoid was the only successful assassination of a senior Nazi leader during World War II.
Answer: Operation Anthropoid