A Lakota and Northern Arapaho attack on the Sawyers Surveying Expedition, where the Bozeman Trail crossed Tongue River near present Dayton, Wyoming, 1 September 1865. The artillerymen belonged to the 6th Michigan Volunteer Cavalry. The Indians attacked as the soldiers were crossing the Tongue, after which Sawyers circled his wagons on the north bank and fought a battle of several hours. After a truce the next day, the Sawyers party was surrounded and stopped for several days. Two of the Daily Graphic engravings show this same encounter, with Sitting Bull prone on the ground behind his shield, firing with a musket at the cannoneers. In the Saville drawing, Sitting Bull is accompanied by a comrade, both on the ground and under heavy fire.