By the time the smoke had cleared and the veterans headed back to their homes, the American Civil War had exacted a terrible human cost. In four long years of bloody fighting, half a million of the three million men and boys in blue and gray had been wounded in combat. Two hundred thousand others had been killed.

These staggering figures may be less surprising after considering all the macabrely ingenious killing machines taken onto Civil War battlefields–rifled cannon, multi-shot arms, crude machine guns, and repeaters, to name a few. But it was not these spectacular weapons that drew the most blood during the Civil War. Ninety percent of the soldiers killed on the fields of battle owed their fate to a deceptively simple hand-held gun and its companion projectile: the rifle-musket and the minié bullet.

The rifle-musket and minié bullet together changed the face of warfare forever. For the first time in history, infantrymen could aim their weapons at a target a fair distance away and actually have a chance of hitting it. The days of successful frontal assaults by infantry and cavalry were over; defenders armed with the new rifle-musket could fire from a safe place and knock down attacker after attacker before they got close enough to do damage.

All this is quite a bit of notoriety for a humble-looking firearm with few visible characteristics to distinguish it clearly from its 1850s predecessor. But in many ways the Civil War rifle-musket was a brand new weapon that boasted the best features of its predecessors. It also had a more reliable ignition system and, more important, it fired a greatly improved projectile, the minié bullet.

The lineage of the Civil War rifle-musket reaches back to early-17th-century France. About 1610, the muzzleloading, smoothbore flintlock musket was invented as an improvement on the matchlock musket, a similar firearm that depended on a lit match for ignition. As the name muzzleloading, smoothbore flintlock musket suggests, the gun was loaded (with loose gunpowder and a round ball) at the mouth of its barrel. The bore, or inside of the barrel, was smooth; unlike the later rifle-muskets, it contained no spiral rifling grooves to force the projectile to spin evenly and thus travel rapidly in a straight line like a spiraling football. The ignition system featured a hammer–called a cock–that held a small piece of flint. When the shooter pulled the trigger, the cock fell and scraped the flint against a rough piece of metal known as the frizzen pan cover. This showered sparks onto loose gunpowder in the frizzen pan, which then ignited the main powder charge inside the barrel, behind the projectile. The British army beat the French army to the punch and officially adopted the weapon in 1682. It eventually became the standard infantry firearm of Europe and America and remained so until the muzzleloading rifle-musket replaced it in the 1850s.

What made the smoothbore flintlock musket so dominant an infantry weapon for so long was that it was easy to load; an experienced soldier could load and fire up to four times a minute, a rapid rate of fire for the time. Since the gun’s barrel was not rifled–it had no grooves that a bullet needed to fit snugly against–the projectile could be cast slightly smaller than the bore diameter. That allowed the ball to fall to the bottom of the upturned barrel with little resistance. To load the weapon, a soldier pulled a paper cartridge containing both powder and ball from his cartridge box and tore off the powder end with his teeth. He primed the flintlock by pouring some of the loose gunpowder from the cartridge into the frizzen pan and closed the pan cover to keep the priming charge in place and dry. Next, he poured the remaining powder down the barrel and rammed the ball down on top of the powder with a metal ramrod. Finally, he stuffed the empty cartridge paper down the barrel to serve as a plug, a stopper strong enough to keep the ball from rolling out by the force of gravity, but weak enough not to obstruct the travel of a fired ball.

The ease of loading the smoothbore musket allowed soldiers to fire quickly, but the shots were not likely to hit their targets. Accuracy and range were not the weapon’s strengths. In fact, firing one of these guns would be similar to shooting a marble from a modern shotgun. The weapon did not even have a rear sight for precise aiming because aiming was a fruitless effort. The statistics boil down to this: at 40 yards, the flintlock smoothbore could usually hit a target measuring 1 square foot, but at 300 yards, only 1 shot in 20 would hit a target of 18 square feet. As Colonel George Hanger, a British officer who fought in the American Revolution, wrote in 1814:

A soldier’s musket if not exceedingly ill-bored (as many are), will strike the figure of a man at 80 yards, perhaps even at 100; but a soldier must be very unfortunate indeed who shall be wounded by a common musket at 150 yards, providing his antagonist aims at him; and as for firing at a man at 200 yards with a common musket, you might just as well fire at the moon and have the same hope of hitting your object. I do maintain and will prove, whenever called on, that no man was ever killed at 200 yards by a common soldier’s musket by the person who aimed at him.

The chance of firing a smoothbore musket and hitting something beyond rock-throwing range was slim, but there was an alternative weapon: the rifle. The venerable Kentucky flintlock rifle, for example, the weapon favored by frontiersmen and by sharpshooters in the American Revolution, was extremely accurate at long ranges. Common practice targets were the head of a tack at 20 yards, the head of a turkey at 100 yards, and the body of a turkey at 200 yards–challenging targets even for today’s sharpshooters with modern rifles and telescopic sights. At 400 yards, an American soldier with a Kentucky rifle could easily hit a target as large as a horse, a fact that made British cavalrymen very uneasy.

The problem with the rifle of the time was that loading it was a difficult and slow process. Because the ammunition had to fit inside the barrel tightly in order to fit in the spiral rifling grooves, soldiers had a tough job forcing it down from the muzzle, especially under combat conditions, when repeated firing quickly filled the grooves with the residue of burnt powder. Before long, the rifleman literally had to pound the tight-fitting bullet down the barrel. As a result, the rifle’s rate of fire was only one-third of the smoothbore’s, making the gun impractical for general military use. Soldiers were better off firing three or four shots a minute in the general direction of an approaching enemy unit than firing once a minute with pinpoint accuracy at individual targets.

What the infantryman needed was a firearm that combined the best of the smoothbore flintlock musket with that of the rifle–a gun that was easy to load and could hit a small target at 200 yards. That gun was the muzzleloading rifle-musket, and with it came the improved bullet that made it possible. Known to common soldiers as the minié ball (which they pronounced ‘minnie ball), the conical bullet could be loaded quickly and easily down a rifle’s muzzle and still fit the barrel’s rifling grooves tightly when fired. But before all this came to bear, inventors and sportsmen were working to perfect a new ignition system.

In 1807, the Reverend Alexander Forsyth, a Presbyterian minister from Belhelvie, Scotland, patented a new, more reliable ignition system than the flintlock system. Rather than have a shower of sparks ignite loose gunpowder, Forsyth employed a flat-nosed hammer to strike powdered fulminate of mercury, which detonated on contact, setting off the main charge of gunpowder inside the barrel. In 1814, Joshua Shaw of Philadelphia improved on Forsyth’s system by packing the fulminate inside a small iron cap and placing it on a hollow nipple fixed to the gun barrel, and in 1816, he replaced the iron with copper. The copper percussion cap was easy to use and virtually impervious to water and wind.

European and American armies embraced the new percussion, or caplock, system because of its reliability. The British army adopted it in 1834 after comparing the results of 6,000 test rounds fired from flintlock and percussion firearms. The flintlocks misfired 922 times (15 percent of the time), while only 36 (0.6 percent) of the percussion weapons misfired. The U.S. Army followed the British lead and adopted the percussion system in 1841. The following year, American armories began building smoothbore percussion muskets and converting older flintlocks to percussion weapons. Progress was slow, however, and the vast majority of American soldiers carried flintlocks in the Mexican War of 1846 to 1848. Even 13 years later, at the beginning of the Civil War, Union and Confederate authorities issued smoothbore flintlock muskets to thousands of unlucky soldiers.

The percussion ignition system made infantry weapons fire more reliably, but there remained the challenge of coupling easy loading with long range and accuracy. And it was here that the minié bullet entered the scene. Developed over a generation, its final design was the fruit of independent work by men from Great Britain, France, and the United States.

Great Britain took the lead. As early as 1818, Captain John Norton of the British 34th Infantry began experimenting with bullet design. Norton shaped the nose of his new bullet like a cone with a rounded point and made its cylindrical base hollow. The hollow base was the bullet’s definitive feature. It allowed the bullet to be cast a bit narrower than the bore’s diameter to allow easy loading, since when the gun was fired, the pressure expanded the base to fit the barrel’s rifling grooves tightly. The inspiration for the bullet came to Norton while he was stationed in India and observed natives using blowpipes as weapons. He discovered that the base of the blowpipe arrow was made of elastic locus pith. When the natives blew, the pith expanded to form an airtight seal against the pipe’s inner walls. It seemed a small jump from there to making a bullet with a base that would expand from the pressure of firing.

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