Question: In what War was Prince Christoph of Hesse accidentally killed?
Context: Every thousand years, the Zoroastrian demon Ahriman returns to wreak havoc on the Earth.  He had been defeated centuries ago by an Immortal named Timothy of Gilliam.  An archaeologist warned Duncan MacLeod that he was the champion chosen to do battle with the forces of evil, namely Ahriman.  Duncan was skeptical, until he saw people he had killed, such as James Horton and Kronos, alive and well.  Others thought Duncan was losing his mind, and when he accidentally killed Richie Ryan because he thought Richie was Ahriman, Duncan felt a deep resentment and retreated to a monastery.  For one year, Duncan was missing on the Watcher's database, and even Joe Dawson couldn't find him.  One year later, Duncan returned to Paris to visit Richie's grave and met Ahriman who was disguised as Kronos and Horton.  Duncan vowed to destroy Ahriman.  A mysterious woman named Sophie Baines knew how to defeat the demon, and although she had died, her spirit guided Duncan and, along with the help of Joe and Father Beaufort, allowed Duncan to defeat the evil demon. The Salvation Army has had a turbulent history in Namibia dating back to 1913 when Major Schaud set up the first corps in Walvis Bay.  Little is known of this venture which is thought to have been brought to an end by the First World War after British South Africa declared war on the then German South-West Africa.  In the 1920s Salvationist families kept an unofficial presence in the towns of Walvis Bay, Usakos and Tsumeb.  By 1928, unofficial corps were also operating in Swakopmund and Windhoek.  The Salvation Army officially returned to Namibia in 1931 with a corps being opened in the town of Usakos.  The campaign ended in tragedy when Captain Claasen, the officer in charge of The Salvation Army in Namibia, was accidentally killed in Italy at the start of World War Two. Brigadier General Duncan Sayre MacInnes (21 February 1860 – 23 May 1918) was a Canadian soldier and engineer who served in South Africa before, during and after the Second Boer War.  Before and during World War I, MacInnes played a key role in the establishment and development of the Royal Flying Corps.  He was accidentally killed while visiting the front on 23 May 1918. Young outlaw Billy Wade, determined to reform, is roped into a robbery by rich businessman George Landon, then framed for it.  Billy's brother Matt is sprung from prison by Landon on the condition he get Billy to go along with the theft.  During a struggle for a gun, Matt is accidentally killed and his teenaged son Ted and others mistakenly believe Billy killed him in cold blood.  Billy pretends to help bandit Ike Garvey but ultimately assists in his capture, earning Ted's forgiveness. Baron Gisborough, of Cleveland in the County of York, is a title in the Peerage of the United Kingdom.  It was created in 1917 for the Conservative politician Richard Chaloner, who had previously represented Westbury (also known as Wiltshire West) and Abercromby in the House of Commons.  Born Richard Long, the son of Richard Penruddocke Long, he had assumed by Royal licence the surname of Chaloner in lieu of Long in 1881, as a condition of inheriting the Guisborough estate and Gisborough Hall from his maternal great-uncle, Admiral Thomas Chaloner.  The latter was a descendant through his mother of Robert de Brus, who founded Gisborough Priory in 1119.  Lord Gisborough's eldest son and heir Richard Godolphin Hume Long Chaloner was accidentally killed in France in 1917 while guarding German prisoners of war, and is buried at Calais.  He was therefore succeeded by his second son, the second Baron.  s of 2011 the title is held by the latter's son, the third Baron, who succeeded in 1951.  He notably served as Lord Lieutenant of Cleveland from 1981 to 1996.  The title remains strongly linked with the town of Guisborough. Luther Crawford Ladd (22 December 1843 – 19 April 1861) was a soldier in the Union Army who was killed during the Baltimore riot of 1861.  He is often referred to as the first Union soldier killed in action during the American Civil War.  Four days earlier, Private Daniel Hough became the first non-combat casualty of the war when he was accidentally killed by a cannon that went off prematurely during a salute to the flag.  Luther Crawford Ladd was 17 years old at the time of his death. Princess Christina Margarethe of Hesse (German: "Prinzessin Christina Margarethe von Hessen" ; 10 January 1933 – 22 November 2011) was the eldest daughter of Prince Christoph of Hesse and Princess Sophie of Greece and Denmark.  From 1956 to 1962, she was married to Prince Andrew of Yugoslavia, with whom she had two children.  Her second marriage to Robert Floris van Eyck, a Dutch artist based in London, lasted from 1962 to 1986. Ahmad Omaid Khpalwak, also spelled as Ahmed Omed Khpulwak, (ca. 1987 – 28 July 2011) was an Afghan journalist who worked for the Pajhwok Afghan News and as a freelance stringer for the BBC since 2008.  After an investigation into his death, it was determined by the International Security Assistance Force that an American soldier had accidentally killed Khpalwak while clearing a broadcast building of terrorists while Tarin Kowt was under attack.  Khpalwak was the third journalist from Pajhwok to be killed in three years.  He was the third BBC reporter to be killed in Afghanistan and the second BBC reporter to be killed in the War in Afghanistan. "Dial "N" for Nerder", also known as "N is for Nerder", is the fourteenth episode of "The Simpsons"<nowiki>'</nowiki> nineteenth season.  It originally aired on the Fox network in the United States on March 9, 2008.  After a prank gone wrong, Bart and Lisa believe they have accidentally killed Martin Prince.  Meanwhile, Marge hires a TV show called "Sneakers" to spy on Homer and see if he is cheating on his diet.  The episode was written by Carolyn Omine and William Wright and directed by Bob Anderson.  During its first broadcast, the episode had an estimated 7.3 million viewers and received a 10 percent audience share.  It was rated TV-PG-DSV in the United States. Christoph Ernst August of Hesse (Frankfurt, 14 May 1901 – Apennine Mountains near Forlì, 7 October 1943) was the fifth son of Prince Frederick Charles of Hesse and Princess Margaret of Prussia.  He was a German SS officer killed accidentally during World War II.
Answer: World War II