In September 2014 alone, the corps made five unsuccessful attempts to meet with Standing Rock Sioux leaders. The next month, a meeting was arranged, but "when the Corps timely arrived for the meeting, Tribal Chairman David Archambault told them that the conclave had started earlier than planned and had already ended," according to a federal judge. At a planned meeting the next month, the tribe took the pipeline off the agenda and refused to discuss it. This stonewalling by tribal leaders continued for a year and a half.