When the Civil War broke out Barton left the Patent Office to become a volunteer. She solicited for supplies to help wounded soldiers. By 1862 she was granted permission to deliver these supplies to the frontline. Providing these services helped her to realize her true calling in life; that call being to respond to human needs. She continued delivering supplies and nursing soldiers for two years and by 1864 was named the superintendent of Union Nurses (Sahlman, n.d.). After the war Barton spent time lecturing about her war experiences; she also worked at the Office of Correspondence and spent time working with the suffragist movement. By 1869 Barton became ill and at the recommendation of her physician she traveled Europe to regain her health.
During Barton’s travels in Europe she learned about the Treaty of Geneva that created the Red Cross. The Treaty of Geneva provided relief to the sick and wounded soldiers. When she returned to the United States she attempted to have President Hayes sign the Treaty of Geneva in order to have a chapter of the Red Cross in the United States; he refused. She was a tireless woman; she worked hard and spent time traveling to Washington, D.C. for support; she gave speeches and wrote articles in an attempt to solicit the support of the