Question: The author of Le Martyre de saint Sébastien would later become a soldier in which war?

Context paragraphs:
Gabriele D'Annunzio: General Gabriele D'Annunzio, Prince of Montenevoso, Duke of Gallese {'1': ", '2': ", '3': 'OMS CMG MVM', '4': "} (] ; 12 March 1863 – 1 March 1938), sometimes spelled d'Annunzio, was an Italian writer, poet, journalist, playwright and soldier during World War I.  He occupied a prominent place in Italian literature from 1889 to 1910 and later political life from 1914 to 1924.  He was often referred to under the epithets "Il Vate" ("the Poet") or "Il Profeta" ("the Prophet").

Hélie de Saint Marc: Hélie Denoix de Saint Marc or Hélie de Saint Marc, (11 February 1922 – 26 August 2013) was a senior member of the French resistance and a senior active officer of the French Army, having served in the French Foreign Legion, in particular at the heart and corps of the Foreign Airborne Battalions and Regiments, the heirs of the 2nd Foreign Parachute Regiment 2 REP, a part constituent of the 11th Parachute Brigade.  Commandant by interim of the 1st Foreign Parachute Regiment 1 REP (disbanded in 1961), Hélie assumed full responsibility for commanding exclusively his regiment towards the Generals' Putsch in April 1961 and would be charged for such action while also distancing accusations that would compromise the integrity of the men acting under his direct orders of command.  He was rehabilitated within his civilian and military rights in 1978 and awarded the high distinction of the Grand-Croix of the Legion of Honor on 28 November 2011.

EMLL 15th Anniversary Show: Mexican professional wrestling promotion Empresa Mexicana de Lucha Libre (EMLL) commemorated their 15th anniversary with two "'EMLL 15th Anniversary Shows".  The first Anniversary show was held on September 22, 1948 in Arena Coliseo in Mexico City, Mexico, EMLL's main venue.  The second event took place two days later on September 24, 1948 in Arena Modelo.  The events commemorated the 15th anniversary of EMLL, which would later become the oldest professional wrestling promotion in the world.  The Anniversary show is EMLL's biggest show of the year, their Super Bowl event.  The first anniversary show featured the EMLL debut of Blue Demon, who would later become one of the iconic figures of Mexican wrestling.

Timoléon d'Espinay: Timoléon d'Espinay (1580–1644), French soldier, was the eldest of the four sons of François d'Espinay, seigneur de Saint Luc (1554–1597), and was himself marquis de Saint Luc.  In 1603 he accompanied Sully in his embassy to London.

William Gwynn: William Gwynn (1856 - 1 April 1897) was a Welsh international rugby union forward who played club rugby for Swansea and would later become secretary of the Welsh Rugby Union.  Gwynn was an all-round sportsman and as well as his success on the rugby pitch he also player cricket for Swansea, of which he became vice-president, and Glamorgan.  Gwynn had also played association football and had captained Battersea College XI through two undefeated seasons.  He would later become a referee and would officiate the very first football game between Swansea Town and Cardiff City.

Nicolas Soret: Nicolas Soret (end of the 16th century in Reims – begin of the 17th century) was a French catholic priest, poet and playwright.  In 1606, he published "La Ceciliade, ou le Martyre sanglant de sainte Cecile, patronne des musiciens, choirs set in music by Abraham Blondet", Paris, Rezé, 1606.

Wrestling at the 1991 Pan American Games: This page shows the results of the Men's Wrestling Competition at the 1991 Pan American Games, held from August 2 to August 18, 1991, in Havana, Cuba.  The Greco-Roman category was notable as it featured a gold medal performance by Randy Couture, who would later become a multi-time world champion in the UFC.  The event also featured a gold medal performance by Mark Coleman, who would later become the first UFC Heavyweight champion.

Arzawa: Arzawa in the second half of the 2nd millennium BC (roughly from late 15th century BC until the beginning of the 12th century BC) was the name of a region and a political entity (a "kingdom" or a federation of local powers) in Western Anatolia.  The core of Arzawa is believed to have been located along the Kestros River (Küçük Menderes), with its capital at Apasa, later known as Ephesus.  When the Hittites conquered Arzawa it was divided into three Hittite provinces: a southern province called Mira along the Maeander River, which would later become known as Caria; a northern province called the Seha River Land, along the Gediz River, which would later become known as Lydia; and an eastern province called Hapalla.

Le Martyre de saint Sébastien: Le Martyre de saint Sébastien is a five-act musical mystery play on the subject of Saint Sebastian, with a text written in 1911 by the Italian author Gabriele D'Annunzio and incidental music by the French composer Claude Debussy (L.124).

Carnavalet Museum: The Carnavalet Museum ( "Musée Carnavalet") in Paris is dedicated to the history of the city.  The museum occupies two neighboring mansions: the Hôtel Carnavalet and the former Hôtel Le Peletier de Saint Fargeau.  On the advice of Baron Haussmann, the civil servant who transformed Paris in the latter half of the 19th century, the Hôtel Carnavalet was purchased by the Municipal Council of Paris in 1866; it was opened to the public in 1880.  By the latter part of the 20th century, the museum was full to capacity.  The Hôtel Le Peletier de Saint Fargeau was annexed to the Carnavalet and opened to the public in 1989.

Supporting paragraphs: Le Martyre de saint Sébastien Gabriele D'Annunzio
Answer: World War I