what was the role of women in it?
Between 400 and 750 women had served as soldiers.
American Civil War
The number of women who served as soldiers during the war is estimated at between 400 and 750, although an accurate count is impossible because the women had to disguise themselves as men.

what is the 4th missouri infantry regiment? An infantry regiment that served in the Confederate States Army. when was it formed? On April 28, 1862. which war is associated with it? American Civil War. what was the cause of the war? The enslavement of black people. between whom did it take place? Northern states and southern states.
wiki:1623303
American Civil War [SEP] Women
The number of women who served as soldiers during the war is estimated at between 400 and 750, although an accurate count is impossible because the women had to disguise themselves as men. Women also served on the Union hospital ship "Red Rover" and nursed Union and Confederate troops at field hospitals. Mary Edwards Walker, the only woman to ever receive the Medal of Honor, served in the Union Army and was given the medal for her efforts to treat the wounded during the war. Her name was deleted from the Army Medal of Honor Roll in 1917 (along with over 900 other, male MOH recipients); however, it was restored in 1977.