Litter bearers bringing wounded men to a Union field hospital after a Civil War battle in Virginia 1863. Hand-colored woodcut

Litter bearers bringing wounded men to a Union field hospital after a Civil War battle in Virginia 1863.

Field hospitals were where most Union wounded were treated for the first time. Doctors here often had to choose whom to care for at the expense of others. (North Wind Picture Archives/Alamy Stock Photo)

North Wind Picture Archives/Alamy Stock Photo