Sacagawea of the Shoshone was the only woman to accompany Lewis and Clark on their exploration of the Western United States in 1804 to 1806. Her infant son was four months old when she was chosen to join the expedition with her husband. Only 17 years old herself, Sacagawea served as an interpreter for the group and also gave them some protection. A woman and child traveling with a party of men was a sign of peace to the Native American people. She proved herself to be a valuable member of the team, performed many courageous and heroic tasks, and knew which plants were edible and which aided in healing.