Question: What 1876 battle was Chief Red Fox's uncle involved in?

Context paragraphs:
American Horse (elder): American Horse (Oglala Lakota: "Wašíčuŋ Tȟašúŋke" in Standard Lakota Orthography) (a/k/a "American Horse the Elder") (1830–September 9, 1876) was an Oglala Lakota warrior chief renowned for Spartan courage and honor.  American Horse is notable in American history as one of the principal war chiefs allied with Crazy Horse during Red Cloud's War (1866–1868) and the Battle of the Little Bighorn during the Great Sioux War of 1876-1877.  Chief American Horse was a son of Old Chief Smoke, an Oglala Lakota head chief and one of the last great Shirt Wearers, a highly prestigious Lakota warrior society.  He was a signatory to the Fort Laramie Treaty of 1868, along with his brothers Chief Red Cloud and Chief Blue Horse.  A month or so after the Treaty, American Horse was chosen a ""Ogle Tanka Un"" (Shirt Wearer, or war leader) along with Crazy Horse, Young-Man-Afraid-of-His-Horses and Man That Owns a Sword.  On September 9, 1876, American Horse was mortally wounded in the Battle of Slim Buttes fighting to protect his family and defending against the white invasion of the "“Paha Sapa“" Black Hills.

Crazy Horse: Crazy Horse (Lakota: Tȟašúŋke Witkó in Standard Lakota Orthography, IPA:/tχaʃʊ̃kɛ witkɔ/ , literally "His-Horse-Is-Crazy"; 1840 – September 5, 1877) was a Native American war leader of the Oglala Lakota in the 19th century.  He took up arms against the United States federal government to fight against encroachment by white American settlers on Indian territory and to preserve the traditional way of life of the Lakota people.  His participation in several famous battles of the American Indian Wars on the northern Great Plains, among them the Fetterman massacre in 1866, in which he acted as a decoy, and the Battle of the Little Bighorn in 1876, in which he led a war party to victory, earned him great respect from both his enemies and his own people.

Pablo the Little Red Fox: Pablo the Little Red Fox is a British-French animated series which ran from March 1999 to December 2012 The hero is the naughty little fox called Pablo and his siblings called Pumpkin and Poppy, their parents, Red Fox and Rose, a dog named Baxter, a hedgehog named Helena, a cat named Finbar, a frog called Fromage, a seagull called Gil and an owl named Madam Owl.

Sierra Nevada red fox: The Sierra Nevada red fox ("Vulpes vulpes necator"), also known as the High Sierra fox, is a subspecies of red fox and likely one of the most endangered mammals in North America.  The fox's Sierra Nevada Distinct Population Segment is estimated at 29 adults near Sonora Pass in California.  The Southern Cascades Distinct Population Segment consists of an estimated 42 adults near Lassen Volcanic National Park and an unknown number of individuals in five areas of Oregon.  No other populations are known.  Interbreeding with non-native red foxes and recruitment success are primary conservation concerns.

Red Fox Inn &amp; Tavern: The Red Fox Inn & Tavern, also known as the Middleburg Inn and Beveridge House, is a historic inn and tavern located in Middleburg, Loudoun County, Virginia.  According to the National Register of Historic Places placard on the building, the Red Fox Inn was established circa 1728.  Some historic artifacts on the building date to about 1830, with additions and remodelings dating from the 1850s, 1890s, and the 1940s.  It consists of a 2 1/2 story-with-basement, five-bay, gable-roofed, fieldstone main block, with a two-story, three-bay, gable-roofed fieldstone rear wing.  The front facade features a one-story, one-bay, pedimented porch dating from the 1940s.  It has a standing seam metal gable roof and exterior end chimneys.  The buildings exhibits design details in the Federal and Colonial Revival styles.  It is thought to be one of the oldest continuously operated inns in Virginia as well as the United States.  The Red Fox Inn & Tavern has served a variety of functions including: stagecoach stop, inn, tavern, butcher shop, apartment house, post office, and hotel.

Chief Red Fox: Chief Red Fox (Lakota: "Tokála Luta," also known as Chief William Red Fox; June 11, 1870 – 1976) was an Oglala Lakota Sioux performer, actor, and Sioux Indian rights advocate, born on the Pine Ridge Reservation in the Dakota Territory.  He was a nephew of famed Sioux war leader, Crazy Horse.

Korean fox: The Korean fox ("Vulpes vulpes peculiosa"), also known as the Korean red fox, is a subspecies of red fox that lives in Korea, Urssi,

American red fox: The American red fox ("Vulpes vulpes fulvus"), commonly known as the eastern American red fox, is a North American subspecies of the red fox ("Vulpes vulpes").  Historically, red foxes were classified as two species: "Vulpes vulpes" in Eurasia and "Vulpes fulva" in the Americas (Tesky, 1995).  Since 1959 they have been considered to be a singular species of "Vulpes vulpes", with "Vulpes fulva" one of the ten subspecies (Hall, 1981; Kamler & Ballard, 2002).  The American red fox differs from European forms by the greater breadth of its feet, its longer fur, noticeably shorter nose and ears, and its finer brush.  According to hunters' accounts, they have less vigor and endurance in the chase compared to the European variant.

Cross fox: At one time the cross fox was considered to be a separate species from the red fox, and was given the binomial name "Canis decassatus" (the fox genus "Vulpes" was then commonly included in the dog genus "Canis").  Fur farmers and trappers continued to treat each red fox colour form as a distinct species long after scientists concluded that they were variations of the same one.

Arabian red fox: The Arabian red fox ("Vulpes vulpes arabica") is a subspecies of the red fox native to Arabia, specifically Dhofar and Al Hajar Mountains in Oman and they are also found in UAE, Syria, Jordan, Palestine, and Israel to Saudi Arabia and Yemen.  The Arabian red fox is similar in color to the common red fox.  However, it is more adapted to desert life than its parent species.  The fox's ears are much larger, and its body is much smaller than that of the red fox.

Supporting paragraphs: Chief Red Fox Crazy Horse
Answer: Battle of the Little Bighorn