Dorothea Dix and Clara Barton were both known for their work as nurses in the Civil War. In American history, Dix is perhaps better known for her work as a social reformer in the decades before the war. She is famous as the woman who got state legislatures to set up the first organized mental asylums in the country’s history. When the Civil War broke out, she was appointed as the head of nurses for the Union Army. She did not do particularly well in this job and had much power taken away from her during the war.
Clara Barton is best known for having founded the Red Cross. However, Barton was also important during the Civil War. She was perhaps the best known nurse in this conflict. She came to be famous as the “angel of the battlefield” for her work.
Thus, the best answer to this is to say that these two women were known for their Civil War efforts in nursing.