Not all emigrants made it to their destination. The dangers of the overland route were numerous: snakebites, wagon accidents, violence from other travelers, suicide, malnutrition, stampedes, Indian attacks, a variety of diseases (dysentery, typhoid, and cholera were among the most common), exposure, avalanches, etc. One particularly well-known example of the treacherous nature of the journey is the story of the ill-fated Donner Party, which became trapped in the Sierra Nevada mountains during the winter of 1846–1847 in which nearly half of the 90 people traveling with the group died from starvation and exposure, and some resorted to cannibalism to survive. Another story of cannibalism featured Alfred Packer and his trek to Colorado in 1874. There were also frequent attacks from bandits and highwaymen, such as the infamous Harpe brothers who patrolled the frontier routes and targeted migrant groups.