1851 - Fort Laramie Treaties 1851

Articles of a treaty made and concluded at Fort Laramie, in the Indian Territory, between D. D. Mitchell, superintendent of Indian affairs, and Thomas Fitzpatrick, Indian agent, commissioners specially appointed and authorized by the President of the United States, of the first part, and the chiefs, headmen, and braves of the following Indian nations, residing south of the Missouri River, east of the Rocky Mountains, and north of the lines of Texas and New Mexico, viz, the Sioux or Dahcotahs, Cheyennes, Arrapahoes, Crows, Assinaboines, Gros-Ventre Mandans, and Arrickaras, parties of the second part, on the seventeenth day of September, A.D. one thousand eight hundred and fifty-one. The Fort Laramie Treay of 1851 defined the Territory of the Lakota and Dakota referred to as The Great Sioux Nation. All of South Dakota West of the Missouri River. This Treaty also promised that no Whites should enter the Sioux Territory without the permission of the Sioux. http://www.lbha.org/Research/lara51.htm

1863-Spetember 2 - Whitestone Massacre

600-700 solider under the command of General Alfred Sully attacked a peaceful village of Ihunktonwan (Yanktonais) at Whitestone Hill North Dakota. 300 Ihunktonwans died. Gebneral Sully lost 20 soldier, most killed by their comrades bullets.
Sully ordered all the Indian property to be destroyed as well as tons of buffalo meat. The Suvivor of Whitestone were taken to Crow Creek Agency as prisoner of war.

1863 - Military Fort built at the present day Fort Yates

In 1863 A Military Fort was built on the banks of the Missouri River called Standing Rock Cantonment which housed soldiers.  The Fort later changed it name to Fort Yates after George W. Yates who died at the Little Big Horn in 1876.

1868 - Grand River Agency

The Grand River Agency was established by the Fort Laramie Treaty of 1868 which was located approximately four miles above the confluence of the Grand and Missouri River. It was situated on the West bank of the Missouri River. About 4,500 Sioux bands from the Blackfeet, Hunkpapa, Cuthead, and Upper and Lower Yanktonai were the four main groups. Small gathering of Brules, Oglala, San Arc and Two Kettle were also at Grand River.

1875 - Mrs Galpin

An incident between the two men occurred when Agent Burke asked Captain Poland to stop a Mrs. Galpin, a half-breed Sioux, from trading with the Indians. Burke charged that she had no license to trade and was consequently conducting a trading post without proper authority. Taking the opposite view, Poland made no effort to stop the activities of Mrs. Galpin.