The crazy improvised gas mask used by World War I troops

Time and again, the oft-repeated military adage is proven right: if it's stupid and it works, it isn't stupid. This old saying might be the military's version of necessity being the mother of invention. Except in the military, necessity could mean the difference between life and death. This was certainly true of U.S. doughboys on the battlefields of World War I, where a single battle could cost up to 10,000 American lives or more.

Americans were used to overcoming long odds in combat. Our country was founded on long odds. But in the Great War, U.S. troops had to contend with a weapon from which they couldn't recover: poison gas.

Many different gas masks were used on the Western Front, but one was more improvised than others.

Throughout American involvement in the First World War, poison gas attacks killed and maimed some 2,000 American troops and countless more allies who had been fighting for years before the doughboys arrived. As a result, all the Allied and Central Powers developed anti-gas countermeasures to try and give their troops a fighting chance in a chemical environment. But gas was introduced as a weapon very early in the fighting, long before the belligerents knew they'd need protection.

But they did need protection. Gas on the battlefield was first administered by releasing the gas from canisters while downwind – a method that could go awry at anytime, causing the wind to shift toward friendly forces. Later on, it would be used in artillery shells that would keep the gas in the enemy's trench – at least, until the friendly troops advanced to take that trench.

German soldiers ignite chlorine gas canisters during the Second Battle of Ypres in Belgium on April 22, 1915.

But early gases weren't as terrifying as chemical weapons developed in the course of the war. The first uses of gas attacks involved tear gas and chlorine gas. While tear gas is irritating, it's relatively harmless. Even the first uses of tear gas on the Eastern Front saw the chemical freeze rather than deploy when fired. Chlorine gas, on the other hand, could be incredibly fatal but was not effective as an instrument of death. Chlorine gas had a telltale smell and green color. Troops knew instantly that the gas had been deployed.

To safeguard against it, allied troops used rags or towels covered in urine to protect their lungs from the gas. The thought was that the ammonia in urea was somehow neutralizing the chlorine to keep it from killing them. That wasn't it at all. Chlorine just dissolves in water, so no chlorine would ever pass through the wet pieces of cloth on their face. They could have used coffee, and the trick would have still worked.

Water (or urine) wasn't effective against what was to come.

Troops burned by mustard gas in the First World War.

More than half a million men were injured or killed by poison gas during World War I. The terrifying, disfiguring effects of gases like colorless phosgene gas that caused lungs to fill with fluid, drowning men in their beds over a period of days. Then there was mustard gas, a blistering agent that could soak into their uniforms, covering their entire bodies with painful, burning blisters.

Small wonder it was banned by the Geneva Protocol in 1925.