As increasing numbers of settlers came upriver, the Yankton Sioux had to decide whether to join other Sioux tribes in armed resistance or to coexist with the immigrants, and they chose peace. Head Chief Struck by the Ree led a delegation of tribal leaders to Washington, D.C., to negotiate a treaty, and in 1858 the tribe ceded most of its lands to the U.S. Government and agreed to move to a reservation on the north side of the Missouri River. Struck by the Ree had been a newborn baby at the 1804 Council at Calumet Bluff, where Meriwether Lewis supposedly wrapped him in an American flag. The land ceded by the Yankton Sioux totaled 11,155,890 acres, with a smaller reservation remaining.