Chain of evacuation: Stretcher Bearers - collected wounded from frontline
Regimental Aid Posts - gave immediate first aid, aimed to get soldiers back to combat
Main Dressing Stations - deals with more serious injuries in bunkers and tents
Casualty Clearing Stations - dealt with more critical injuries, set up in old factories or schools as they had running water
Base hospitals - near the coast so the wounded could travel back to Britain, doctors specialised in specific injuries