You would be removed from the front by a stretcher bearer if it was on difficult terrain and you could not walk. Otherwise you would walk yourself to a Regimental Aid Post. If your injury was minor you would be treated there. If not you would be sent to a Dressing Station. Again, if you were fit enough to return, you would be sent back. If not you would be moved on to the Casualty Clearing Stations. Here you would be patched up or sent back, sent to hospital or given your last rites by a priest (as you were likely to die)