Toussaint-Henry-Joseph Fafchamps
Joseph Montigny further improved the weapon, completing the transportable 37-barrels Montigny mitrailleuse (also known as the "Fafschamps-Montigny mitrailleuse") in 1863. From 1859, Joseph Montigny proposed his design to Napoleon III, which led to the development of the French Reffye mitrailleuse, designed by Jean-Baptiste Verchère de Reffye with the collaboration of Montigny, and which was adopted by the French Army in 1865. The invention of Fafschamps thus became the basis of the "mitrailleuse", which was used by the French in the Franco-Prussian War of 1870. Initially kept under wraps as a secret weapon, it became widely used in battle by French artillery during the Franco-Prussian War (1870–71).
Rifled musket
Rifles were more expensive to make than muskets, and were typically used by small units of specialized riflemen trained not to fight in closed ranks, but in open order, spread out as skirmishers or sharpshooters. Since they were not fired over other men’s shoulders or designed for close-combat bayonet fighting, military rifles could be much shorter than muskets, which also made loading from the muzzle easier and reduced the difficulties associated with fitting the bullet into the barrel, although the rate of fire was still slower than that of a musket. 
The problem of slow loading of rifles caused by barrel fouling was solved by the Minié ball, which was invented in the 1840s by French inventor Claude-Étienne Minié. Despite its name, the Minié ball was not a round ball at all - it was long and conical, with an expanding skirt at the rear of the bullet. The skirt allowed the minié ball to be smaller than the barrel's bore, so it would slip in as easily as the ball of a smoothbore. When the weapon was fired, the skirt expanded to fit tightly against the inside of the rifle barrel, with less energy wasted in blow-by around the projectile and insuring that the rifling lands and grooves would impart a stabilizing spin to the minié ball.