I am sorry, but if you want to live it has to be done.
As the lieutenant approaches he can see ambulances stuck in the mud, while the drivers place the blame on each other he can hear groans of pain.
As the lieutenant walks through the field he walks past a surgeon who greets him, then realizes the wound on his arm and has the lieutenant come into the tent.
The surgeon looked at the wound with uncertainty, then the lieutenant said that he won't amputate his arm. Then the doctor says to follow him into the school house, where the lieutenant's worst nightmare came to life.