In 1828, Thouvenin modified and improved upon Delvigne’s gun design. He replaced the lip and powder chamber inside the barrel with a hard metal post that screwed into the gun’s breech. After loading, the flat base of the elongated, cylindrical lead bullet rested upon the post in a position to be easily and uniformly forced into the rifling grooves when compressed by the ramrod. The Thouvenin design was a moderate improvement over Delvigne’s, and the French army selected it for trials in 1846. The gun and bullet combination was still not practical for widespread military use; the rifle breech was very difficult to clean, and the metal post was prone to breaking.

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Delvigne’s developments inspired Minié, who had served with the French Chasseurs in several African campaigns, to do further work toward making an efficient, effective bullet. In 1849, he came up with one that more closely resembled Norton’s than Delvigne’s. Like Norton’s bullet, Minié’s had a hollow cylindrical base and a rounded conical nose. Minié also incorporated a plug in the bullet’s hollow base to assist expansion, just as Greener had done to Norton’s design. Instead of a wooden plug, however, Minié used an iron cup, which in effect served the same purpose as Thouvenin’s metal post. The explosion of the gunpowder would drive the iron cup forward and expand the bullet’s base to fit the rifling grooves snugly.

By this point in the story, it should not be surprising to learn that the French army never adopted the new bullet. It took the British army to use it in their new 1851 Enfield rifles, paying Minié 20,000 pounds for his patent. The army also had to pay Greener 1,000 pounds, after he won a patent infringement lawsuit over the bullet’s plug design. The bullet as it would be used by the soldiers in blue and gray was now virtually complete. It had also acquired the name that stuck among English-speaking troops–minnie ball, even though the captain’s French surname was properly pronounced min-YAY and his innovation was not a ball but a cone-shaped bullet.

In the early 1850s, James H. Burton, a master armorer at the U.S. arsenal at Harpers Ferry, Virginia, gave the minié bullet the form it would take into the Civil War. By lengthening the bullet slightly and thinning the walls of its hollow base, Burton was able to dispense with the iron plug. The base of the improved bullet expanded just as well as Minié’s but was much easier and cheaper to mass-produce. By the mid-1850s, the fully evolved minié bullet made it possible to build an infantry weapon as easy to load as the old smoothbore musket but with the accuracy and range of a rifle. The term rifle-musket reflected the weapon’s lethal combination of attributes.

U.S. Secretary of War Jefferson Davis, future president of the Confederacy, adopted the rifle-musket and minié bullet for the U.S. Army in 1855. An improved version of the rifle-musket–the 1861 model built by the federal armory in Springfield, Massachusetts–became the principal infantry weapon of Northern soldiers in the Civil War.

Hundreds of thousands of Union troops carried the 1861 Springfield onto the battlefields of the Civil War, and untold numbers of Confederates captured the weapon and used it themselves. Between 1861 and 1865, the Springfield armory manufactured nearly 800,000 of the guns; private contractors built 880,000 more; and slightly modified 1863 and 1864 models accounted for an additional 500,000. That put the total number of minié-bullet-firing Springfield rifle-muskets at more than 2 million.

The Springfield rifle-musket was a .58-caliber percussion weapon that weighed nearly 10 pounds and cost about $15. It was 58 inches long with a 40-inch barrel, and came with an 18-inch bayonet. On the negative side, bullets exited the Springfield’s barrel at the relatively slow speed of only 950 feet per second (about the same as a modern .22-caliber rifle), but the gun’s deadly accuracy at long ranges outweighed that shortcoming. Armed with a Springfield, a competent shooter could hit a 27-inch bull’s-eye at 500 yards, the best performance to date for a standard-issue infantry weapon. A trained marksman could consistently hit a 4-inch target at 200 yards and a 6-by-6-foot target at 500 yards. At 1,000 yards, he could even hit an 8-by-8-foot target half of the time. That did not mean that the average Civil War soldier could hit anything at the more extreme distances, but improving the old smoothbore’s 75-yard range by 125 yards dramatically increased the effectiveness of even the most inept infantryman.

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