At approximately 12:00 - (2) Truck drawn horse trailers leading a convoy of protesters northbound from the camp area - approximately 50-plus vehicles. Another (50) people reported forming at the Sacred Stone Camp.At approximately 13:15 Protesters trying to tear down Concertina Wire at AR 115. At approximately 14:03 (75) protesters and several on horseback at Kent Morrell Farm 5-miles S. and 3-Miles W. of St. Anthony (2501 MC RD 82). Protest group making claims of using mustard gas against protestors as a result of sighting a spray plane doing routine agricultural spraying in the area. Total Number of arrested – (21).