Question: Emil Lewis Holmdahl fought under which Mexican Revolutionary general?

full_context: Document 1: Samuel P. Heintzelman: Samuel Peter Heintzelman (September 30, 1805 – May 1, 1880) was a United States Army general. He served in the Seminole War, the Mexican-American War, the Yuma War and the Cortina Troubles. During the American Civil War he was a prominent figure in the early months of the war rising to the command of a corps.
Document 2: Emil Lewis Holmdahl: Emil Lewis Holmdahl (August 26, 1883 – April 8, 1963) was a machine gunner, soldier of fortune, spy, gun runner, and treasure hunter who fought under John J. Pershing in the Spanish–American War in the Philippines, under Lee Christmas in Central America, under Francisco Madero, Pancho Villa, and Venustiano Carranza in the Mexican Revolution, and under John J. Pershing in World War I. In 1926, Holmdahl was accused of having stolen Francisco Pancho Villa's head.
Document 3: Pancho Villa Returns: Pancho Villa Returns is a 1950 film directed by Miguel Contreras Torres and starring Leo Carrillo as the legendary Mexican revolutionary general, Pancho Villa.
Document 4: United States Army Indian Scouts: Native Americans have made up an integral part of U.S. military conflicts since America's beginning. Colonists recruited Indian allies during such instances as the Pequot War from 1634–1638, the Revolutionary War, as well as in War of 1812. Native Americans also fought on both sides during the American Civil War, as well as military missions abroad including the most notable, the Codetalkers who served in World War II. The Scouts were active in the American West in the late 19th and early 20th centuries. Including those who accompanied General John J. Pershing in 1916 on his expedition to Mexico in pursuit of Pancho Villa. Indian Scouts were officially deactivated in 1947 when their last member retired from the Army at Fort Huachuca, Arizona. For many Indians it was an important form of interaction with white American culture and their first major encounter with the whites’ way of thinking and doing things.
Document 5: Donato Guerra: General Donato Guerra (1832-1876) was the leader of the Mexican Army during the time of La Reforma. Born in Jalisco, he participated in the Reform War and in the French intervention. He joined the Plan de la Noria and Tuxtepec.
Document 6: Amelio Robles Ávila: Amelio Robles Avila was a colonel during the Mexican Revolution. He was born a woman with the name of Amelia Robles Ávila on November 3, 1889 in Xochipala, Guerrero. His father was named Casimiro Robles and his mother Josefa Ávila. His father was a wealthy farmer who owned 42 acres of land and owned a small Mezcal factory.
Document 7: H. H. Holmes: Herman Webster Mudgett (May 16, 1861 – May 7, 1896), better known under the name of Dr. Henry Howard Holmes or more commonly H. H. Holmes, was an American serial killer of the 19th century.
Document 8: Herman Hollis: Herman Edward "Ed" Hollis (January 1903 – November 27, 1934) was an American law enforcement official and Federal Bureau of Investigation (FBI) special agent. As an FBI special agent in the 1930s, Hollis worked with agents Melvin Purvis, Samuel P. Cowley and others fighting bank robbers, gangsters and organized crime in the Chicago area during the Great Depression. Hollis is best known for having been killed in the line of duty during an intense shootout with Chicago-area bank robber Lester Gillis, a.k.a. Baby Face Nelson, at the Battle of Barrington in 1934. Hollis was also one of the three FBI special agents who shot John Dillinger near the Biograph Theater earlier that year, resulting in Dillinger's death. One controversial account also implicates Hollis in the death of Pretty Boy Floyd. Hollis served as a special agent for the FBI's field offices in Kansas City, Cincinnati, and Chicago for over seven years; at the time of his death, he was 31 years old.
Document 9: Elmer McCurdy: Elmer J. McCurdy (January 1, 1880 – October 7, 1911) was an American bank and train robber who was killed in a shoot-out with police after robbing a Katy Train in Oklahoma in October 1911. Dubbed "The Bandit Who Wouldn't Give Up", his mummified body was first put on display at an Oklahoma funeral home and then became a fixture on the traveling carnival and sideshow circuit during the 1920s through the 1960s. After changing ownership several times, McCurdy's remains eventually wound up at The Pike amusement zone in Long Beach, California where they were discovered by a film crew and positively identified in December 1976.
Document 10: Basil Zaharoff: Basil Zaharoff, GCB, GBE (Greek: Βασίλειος Zαχαρίας Ζαχάρωφ ; October 6, 1849 – November 27, 1936), usually known by his honorific title Sir Basil Zaharoff, was a Greek arms dealer and industrialist. One of the richest men in the world during his lifetime, Zaharoff was variously described including “merchant of death” and “mystery man of Europe”. His success was forged through his cunning, often aggressive and sharp business tactics. These included the sale of arms to opposing sides in conflicts, sometimes delivering fake or faulty machinery, and reportedly sabotaging trade demonstrations.
Document 11: Juan Carlos Caballero Vega: Juan Carlos Caballero Vega (June 24, 1900 – March 30, 2010) was a Mexican revolutionary. Caballero worked as the personal driver and chauffeur for Mexican Revolutionary general Pancho Villa for more than two years.
Document 12: Pancho Villa: Francisco "Pancho" Villa (born José Doroteo Arango Arámbula; 5 June 1878 – 20 July 1923) was a Mexican Revolutionary general and one of the most prominent figures of the Mexican Revolution.
Document 13: Emiliano Zapata: Emiliano Zapata Salazar (] ; 8 August 1879 – 10 April 1919) was a leading figure in the Mexican Revolution, the main leader of the peasant revolution in the state of Morelos, and the inspiration of the agrarian movement called "Zapatismo".
Document 14: Porfirio Díaz: José de la Cruz Porfirio Díaz Mori (] ; 15 September 1830 – 2 July 1915) was a Mexican general and politician who served seven terms as President of Mexico, a total of three and a half decades from 1876 to 1880 and from 1884 to 1911. A veteran of the War of the Reform (1858–60) and the French intervention in Mexico (1862–67), Díaz rose to the rank of General, leading republican troops against the French-imposed rule of Emperor Maximilian. Seizing power in a coup in 1876, Díaz and his allies, a group of technocrats known as "Científicos", ruled Mexico for the next thirty-five years, a period known as the "Porfiriato".
Document 15: Machine Gun Kelly: George Kelly Barnes (July 18, 1895 – July 18, 1954), better known as "Machine Gun Kelly", was an American gangster from Memphis, Tennessee, during the prohibition era. He attended Central High School in Memphis. His nickname came from his favorite weapon, a Thompson submachine gun. His most infamous crime was the kidnapping of oil tycoon and businessman Charles F. Urschel in July 1933 for which he, and his gang, collected a $200,000 ransom. Their victim had collected and left considerable evidence that assisted the subsequent FBI investigation that eventually led to Kelly's arrest in Memphis, Tennessee, on September 26, 1933. His crimes also included bootlegging and armed robbery.
ground_truth: Francisco "Pancho" Villa