As is often the case something was staring me in the face.
Due to my interest in first aid training I was looking at my 1911 RAMC training manual and it has proved to be a wealth of information. Firstly it helped with another blog article, but is also covers the role and organsiation of the Field Ambulance. If you've read my recent posts here you'll know why this has caused so much excitement (well for me anyway).
Whilst it is easy to find out dated material in a manual almost 100 years old, it is also possible to find practices still current.
This technique is still in use in many areas, as shown here.