1 - Stretcher Bearers had most hazardous task of war removing dead and injured from no man's land, often under artillery or gas fire. Carried medical basics.
2 - RAP was as basic as a dugout where basic first aid could be administered to either patch a soldier up, or send him on to the next stage.
3 - Field Ambulance were half a mine from the front line. They were a tented area with two dressing stations - an advanced dressing station and a main dressing station. Still only limited treatment.
4- CCS was 12 miles approx from the front line and had most things needed for the very sick e.g. operating theatres, medical and surgical wards. Approx 50 beds and 150 stretchers.
5 - General/Stationary Hospital - Usually civilian hospitals or large buildings near railways. Quality varied considerably - could be a decayed convent, or a specialist centre for gas poisoning.
6 - Railway - specially converted railway carriages taking soldiers home
7 - Ships - converted passenger liners taking patients across the Channel for final leg
8 - British Hospitals - most serious cases which attracted the best and most pioneering practitioners. Would deal with head and chest trauma, or those needed maxillofacial (mouth, jaw, face and neck surgery).