Mary E. Walker, MD
The only woman ever awarded the Congressional Medal of Honor, she was a military doctor during the Civil War. The award was signed by Andrew Johnson, taken away under Woodrow Wilson, and reinstated by Jimmy Carter.This page
is a condensed version of her life.
Writing about Major General Rainville reminded me of Dr. Walker. [Edit: Woodrow Wilson was a Virginian who thought D.W. Griffith's The Birth Of A Nation was "fair and balanced".]