In 1837-38 a smallpox epidemic spread from the American Fur Trading Company steamboat St. Peter, which had docked at Fort Union. The disease, for which the Indians had no immunity, eventually affected all Montana tribes. Among the Crow, a story tells of two young warriors returning from a war expedition to find their village stricken. One found his sweetheart among the dying, and both, grieving the loss of friends and family and despairing that nothing could alter events, dressed in their finest clothing and mounted a snow-white horse. Riding double and singing their death songs, they drove the blindfolded horse over a cliff and landed at what is now the eastern end of the Yellowstone County Exhibition grounds. Six teenage boys and six teenage girls who were not afflicted witnessed what happened, buried the dead warriors, and left the camp. Great loss of life among the tribe followed in the wake of the epidemic, and the location is remembered as The Place Where the White Horse Went Down.