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Military medicine has come a long way since the days when injured soldiers were left on the battlefield, waiting for help that came only once the fighting had stopped. 

Surgeons know that the only hope for severely wounded soldiers is to be treated as soon as possible. But until the late 18th century, combat officers had to be persuaded that it was worth risking the lives of healthy soldiers to rescue the wounded.

A soldier being carried off the battlefield seated on a bayonet carried by his comrades Wellcome Collection, CC-BY
A badly wounded soldier being carried off the battlefield on a makeshift stretcher made of bayonets, 18th century.

Napoleon's chief surgeon Dominique Larrey (1766–1842) was the first to set up a dedicated corps for removing the injured during battle. His ‘brancardiers’ (stretcher-bearers) removed the wounded from the battlefield and transported them to treatment at makeshift dressing stations.

The flying ambulance

Larrey also devised the 'flying ambulance' to evacuate the wounded from the battlefield. Once the brancardiers located an injured soldier they took him to an ambulance wagon.

The flying ambulance was more than a mode a of transport. It was a mobile treatment centre  with medical staff, equipment and padded mattresses to lay the wounded. The horse-drawn vehicle itself was called the ambulance wagon. 

Model of an early horse drawn field ambulance Science Museum Image source
Model of Larrey's flying ambulance, 1790s.

The flying ambulance could act as a field station in the war zone, treating the wounded on site  then transporting the seriously wounded to field hospitals for further treatment and care.

Larrey made many important innovations in medicine in the war zone. He realised that an organised system of military medicine would save the lives of soldiers so that they might fight another day.

From chaos to triage

The triage system is a way to direct medical staff and resources to where they will be most effective. It was first used by Dominique Larrey in the Napoleonic Wars, and it is still used today in busy Accident and Emergency departments as well as in combat.

Painting of the Battle of Waterloo by Denis Dighton: British Hussars of Viviene's Brigade. Wikimedia Commons, public domain Image source
The Battle of Waterloo, 1815, by Denis Dighton

By the end of a major battle, medical teams are overwhelmed by the sheer number of casualties arriving at a field station on foot, or brought by stretcher-bearers and in ambulances. Without a systematic way to receive the wounded, things can very easily descended to chaos.

Charles Bell, a surgeon who volunteered at the Battle of Waterloo (1815), where Napoleon was defeated, described the situation at one of the base hospitals in Belgium:

While I amputated one man's thigh, there lay at one time thirteen, all beseeching to be taken next... It was a strange thing to feel my clothes stiff with blood, and my arms powerless with the exertion of using the knife... [Charles Bell, Quarterly Review volumes 72–73, (1843)]

Triage in the First World War

The modern triage system was developed in the First World War when the only way to cope with the sheer numbers of casualties was to have an efficient administrative system that identified and prioritised injuries as they arrived.

The wounded were divided into three categories that could be summed up as 'trivial, treatable and terrible'. Soldiers with minor injuries were treated quickly and returned to the front line. Those with more serious but still treatable injuries were essential treatment and prepared for transportation to the base hospital. Those with little chance of recovery were given pain relief, usually opium or morphine, and seen by the surgeons when the other categories had been cleared.

First World War soldiers at an advance dressing station
British soldiers waiting at an advance dressing station for assessment and initial treatment.

The system was only effective if patients were dealt with quickly and constantly reassessed while waiting for treatment, because a 'treatable' case might become a 'terrible' case if the patient had to wait too long for attention.  

Triage brought organisation and efficiency to urgent medical care, and after the First World War, it became standard practice in military medicine.

Transporting the wounded

A reliable transport network for moving the wounded away from the front line is essential to military medicine.

Dressing stations at the front line could treat most of the 'walking wounded', but those with more serious injuries had to be transported further away to field stations with more facilities. And those with serious injuries had to be transported to base hospitals once their condition was stable enough for travel.  

Return from the Battle of Inkerman by Elizabeth Thompson WikiArt, public domain.
'The Return from the Battle of Inkerman', by Elizabeth Thompson, 1877. A major battle in the Crimean War.

The catastrophic failure of medical systems during the Crimean War (1853–56) demonstrated the vital importance of a good transport network.

The Chain of Evacuation

As with much of military medicine, a major innovation came in the First World War, with the introduction of an infrastructure for medical transportation called the 'chain of evacuation'. This network of medical transport took an injured soldier from the front line to the  dressing station, then on to a field hospital and if necessary, on to the base hospital. 

Different armies in different theatres of war might have used slightly different systems and a variety of modes of transport, but the objective remained the same: to get the injured to treatment as quickly as possible. 

The RAF news magazine, The Gen featured a film called "Middle East Desert Doctor." about tent surgery at Advance Dressing Station 21 in the Second World War. It shows the chain of evacuation from the dressing station, via ambulance to the airport where a converted Bristol Bombay plane takes the seriously wounded to a base hospital back in Britain.

The principle of the chain of evacuation is still in use. It has kept up with improvements in global transport. In the Second World War (1939–45), aeroplanes were used to send the seriously wounded to base hospitals, alongside motorised vehicles, trains and ships.

The concept of the ‘Golden Hour’ - that vital first hour in which a patient with multiple injuries had to be treated - helped to prioritise medical infrastructure post-Second World War and better transport made the ‘Platinum Ten Minutes’[pdf] a viable target for getting the wounded to treatment.

A wounded soldier being stretchered off a helicopter in the Korean War
A helicopter delivering wounded to the US 8076th Mobile Army Surgical Hospital, in Korea, 1951.

By the Korean War (1950–53), helicopters could transport the wounded to local Mobile Army Surgical Hospitals (MASH units) near the war zone within minutes. During the Vietnam War (1955–75), it took 45 days for a seriously injured soldier to return to the United States, by the Iraq War (2003–11), it took less than four days.

Every available type of vehicle and animal has been used to transport the wounded from the war zone. Fortunately, the modes of transport and mobile and portable equipment used by medical teams on the move have kept up with technological change.

Suggestions for further research

  • Between Flesh and Steel by Richard A Gabriel, Potomac Books, 2013
  • War Medicine and Modernity edited by R Cooter, M Harrison and S Sturdy, Sutton Publishing UK, 1998
  • Wars, Pestilence and the Surgeon's Blade by T Scotland and S Heys, Helion and Company Ltd, 2013
  • How did WW1 change the way we treat war injuries today?, BBC iWonder website (viewed February 2019)