Question: Torrens Knight took part in a massacre that was revenge for what attack?
Context: The Spirit Lake Massacre (March 8–12, 1857) was an attack by a "Wahpekute" band of Santee Sioux on scattered Iowa frontier settlements during a severe winter.  Suffering a shortage of food, the renegade chief Inkpaduta (Scarlet Point) led 14 Sioux against the settlements near Okoboji and Spirit lakes in the northwestern territory of Iowa near the Minnesota border, in revenge of the murder of Inkpaduta's brother, Sidominadotah, and Sidominadotah's family by Henry Lott.  The Sioux killed 35-40 settlers in their scattered holdings, took four young women captive, and headed north.  The youngest captive, Abbie Gardner, was kept a few months before being ransomed in early summer.  It was the last Native American attack on settlers in Iowa, but the events increased tensions between the Sioux and settlers in the Minnesota Territory. The Halabja chemical attack (Kurdish: "Kîmyabarana Helebce کیمیابارانی ھەڵەبجە"), also known as the Halabja Massacre or Bloody Friday, was a massacre against the Kurdish people that took place on March 16, 1988, during the closing days of the Iran–Iraq War in the Kurdish city of Halabja in Southern Kurdistan.  The attack was part of the Al-Anfal Campaign in northern Iraq, as well as part of the Iraqi attempt to repel the Iranian Operation Zafar 7.  It took place 48 hours after the fall of the town to the Iranian army. The Massacre of Margarita Belén took place during the Dirty War in Argentina.  It involved the torture and execution of 22 Montoneros, some of whom were killed after surrendering and laying down their weapons near the town of Margarita Belén, Chaco Province, on 13 December 1976, in a joint operation of the Argentine Army and the Chaco Provincial Police.  One of the victims of the massacre, Néstor Carlos Salas, is reported to have been a Montoneros commander and took part in a number of guerrilla operations.  Argentina was at the time ruled by the National Reorganization Process. Brandimarte is a fictional character of the Matter of France.  He appears in Matteo Maria Boiardo's "Orlando Innamorato" and Ludovico Ariosto's "Orlando Furioso".  He is a Saracen knight who was baptized by Orlando and became his loving friend.  He took part in the Siege of Biserta.  Orlando, Oliver, and Brandimarte were the three companions who took part in the final combat on Lampedusa, where he was killed by Gradasso. The 1977 Atocha massacre, a part of neofascist terrorism in Spain, was an attack during the Spanish transition to democracy after the death of Franco in 1975, killing five and injuring four.  It was committed on January 24, 1977, in an office located on 55 Atocha Street near the Atocha railway station in Madrid, where specialists in labour law, members of the Workers' Commissions trade union (CCOO), and of the then-clandestine Communist Party of Spain (PCE), had gathered.  The next day, the massacre was defended by a group calling itself "Alianza Apostólica Anticomunista" (literally The Apostolic Anticommunist Alliance, abbreviated Triple A or AAA).  The suspects arrested were close to Blas Piñar's "Fuerza Nueva" far-right party, the Falange-JONS and the Franco Guard.  The indignation brought about by the killings accelerated the legalisation of the Communist party, which took place in Easter 1977.  On March 24, 1984, the Italian daily "Il Messaggero" stated that, possibly, Italian neo-fascists had taken part in the shootings, pointing toward some kind of "Black International".  This allegation was confirmed by a report from the Italian CESIS, which confirmed that Carlo Cicuttini, who was also involved in the Peteano massacre, took part in the Atocha massacre. Admiral of the Fleet Sir Thomas John Cochrane GCB (5 February 1789 – 19 October 1872) was a Royal Navy officer.  After serving as a junior officer during the French Revolutionary Wars, he captured the French ship "Favourite" off the coast of Dutch Guiana and then took part in various actions including the capture of the Virgin Islands from Danish forces, the capture of the French island of Martinique and the capture of the French archipelago of Îles des Saintes during the Napoleonic Wars.  He also took part in the burning of Washington and the attack on Baltimore during the War of 1812. Torrens Knight (born 4 August 1969) is a Northern Ireland loyalist, who belonged to the North Antrim and Londonderry Brigade of the Ulster Defence Association (UDA).  In 1993 he took part in the Greysteel massacre (in which eight civilians were shot dead) and the Castlerock killings (in which three civilians and a Provisional Irish Republican Army (IRA) member were killed).  After being convicted—along with three others—for the killings, he served seven years in the Maze Prison before his release in 2000 under the terms of the Belfast Agreement. The Rumbula massacre is a collective term for incidents on two non-consecutive days (November 30 and December 8, 1941) in which about 25,000 Jews were killed in or on the way to Rumbula forest near Riga, Latvia, during the Holocaust.  Except for the Babi Yar massacre in Ukraine, this was the biggest two-day Holocaust atrocity until the operation of the death camps.  About 24,000 of the victims were Latvian Jews from the Riga Ghetto and approximately 1,000 were German Jews transported to the forest by train.  The Rumbula massacre was carried out by the Nazi Einsatzgruppe A with the help of local collaborators of the Arajs Kommando, with support from other such Latvian auxiliaries.  In charge of the operation was Higher SS and Police Leader Friedrich Jeckeln, who had previously overseen similar massacres in Ukraine.  Rudolf Lange, who later participated in the Wannsee Conference, also took part in organising the massacre.  Some of the accusations against Latvian Herberts Cukurs are related to the clearing of the Riga Ghetto by the Arajs Kommando.  The Rumbula killings, together with many others, formed the basis of the post-World War II Einsatzgruppen trial where a number of Einsatzgruppen commanders were found guilty of crimes against humanity. The Greysteel massacre was a mass shooting that happened on the evening of 30 October 1993 in Greysteel, County Londonderry, Northern Ireland.  Three members of the Ulster Defence Association (UDA), a loyalist paramilitary group, opened fire in a crowded pub during a Halloween party, killing eight civilians and wounding thirteen.  The pub was in an Irish Catholic and Irish nationalist area.  The group claimed responsibility using their cover name "Ulster Freedom Fighters" and said that the attack was revenge for the Shankill Road bombing by the Provisional IRA a week earlier. By the time of the Anschluss of Austria in 1938 he had reached the rank of Generalmajor as the commander of the Austrian Army motorized division and transferred to the Wehrmacht with the same rank and was appointed commander of the 4th Light Division upon its formation in Vienna.  The unit was renamed the 9th Panzer Division and Hubicki commanded it through the invasion of Poland in which it took part in the Battle of Jordanów and Battle of Jaroslaw.  It then took part in the invasions of France and The Netherlands and Hubicki was promoted to Generalleutnant in August 1940.  He then led the division in the Balkans and was awarded the Knight's Cross of the Iron Cross for his role in that campaign.
Answer: Shankill Road bombing