History of Montana degree of longitude northward to the boundary line of the British possessions. The boundaries of Montana territory did not change during its existence. Montana was admitted to the Union as the state of Montana on November 8, 1889. The Battle of the Little Bighorn—also called Custer's Last Stand and the Battle of the Greasy Grass—was an armed engagement between a Lakota (Sioux)-Northern Cheyenne-Arapaho combined force and the 7th Cavalry of the United States Army. It occurred June 25–June 26, 1876, near the Little Bighorn River in eastern Montana Territory near present-day Hardin, Montana, on land that today is part of
Battle of the Little Bighorn based on the Yellowstone River at the mouth of the Bighorn and reinforced by Gibbon's column. On August 8, 1876, after Terry was further reinforced with the 5th Infantry, the expedition moved up Rosebud Creek in pursuit of the Lakota. It met with Crook's command, similarly reinforced, and the combined force, almost 4,000 strong, followed the Lakota trail northeast toward the Little Missouri River. Persistent rain and lack of supplies forced the column to dissolve and return to its varying starting points. The 7th Cavalry returned to Fort Abraham Lincoln to reconstitute. The regimental commander, Colonel Samuel D. Sturgis, returned