This is episode Four of the Invisible Excellence podcast series.  It takes the listener right into the operating tents of the Army’s first ever battlefield hospital that actually moved long the front lines with the action– Council Bluffs’ Unit K/Mobile #1. The group’s leader, surgeon and former Council Bluffs mayor Donald Macrae, Jr., set the tone in his notes: “The shelling was begun about midnight, and the whine and explosion of the projectiles continued until after daylight.”  This episode focusses on the unit’s first camps in France, the challenges they  aced, and the dogged persistence and courage they employed that redefined battlefield medicine.  Guest is writer/researcher Brian Mainwaring.