The Hardest Part of Lewis and Clark's Journey

The hardest part, I think, of Lewis and Clark's journey was at the Bitterroot Mountains. According to National Geographic, Lewis and Clark ran out of their whiskey supply, which was considered safe, unlike the water there which was either undrinkable or frozen over. Also, they ran out of tobacco to trade with the Indians there. Encyclopaedia Brittanica said that Lewis and Clark were low on food so they had to eat their own horses. They needed the horses to cross the mountain, but they were on a food shortage so that's another reason why I chose the Bitterroot Mountain incident as Lewis and Clark's most challenging part of their journey.