The camp is under fire and is swamped with wounded. They are being attacked by their own artillery in a frightening "friendly fire" incident. Trapper and Margaret get trapped in the Supply Tent together. Frank's jealousy of Trapper drives him to propose to Margaret.
The 4077th Mobile Army Surgical Hospital is stuck in the middle of the Korean war. With little help from the circumstances they find themselves in, they are forced to make their own fun. Fond of practical jokes and revenge, the doctors, nurses, administrators, and soldiers often find ways of making wartime life bearable.