From the Richmond Sentinel, 4/22/1864, p. 1, c. 3

Female Yankee Surgeon. – The female Yankee surgeon captured by our pickets a short time since, in the neighborhood of the army of Tennessee, was received in this city yesterday evening, and sent to the Castle in charge of a detective. Her appearance on the street in full male costume, with the exception of a gipsey hat, created quite an excitement amongst the idle negroes and boys who followed and surrounded her. She gave her name as Dr. Mary E. Walker, and declared that she had been captured on neutral ground. She was dressed in black pants and black or dark talma or paletot. She was consigned to the female ward of Castle Thunder, there being no accommodations at the Libby for prisoners of her sex. We must not omit to add that she is ugly and skinny, and apparently above thirty years of age.