1866 treaty negotiations between US government and Lakota Sioux
1. US wanted to persuade Lakota Sioux to allow prospectors to travel safely through Bozeman Trail
2. Before talks began, Red Cloud discovered US had begun building forts along Bozeman Trail
3. Red Cloud realised US would allow prospectors to travel Bozeman Trail whether Lakota Sioux agreed or not
4. Red Cloud called off negotiations and chose to fight instead