With the invention of new weaponry, the concept of line infantry began to wane. The Minié ball, an improved rifle ammunition, allowed individual infantrymen to shoot more accurately and over greatly increased range. Men walking in formation line-abreast became easy targets, as evidenced in the American Civil War. The Austro-Prussian War in 1866 showed that breech-loading rifles, which gave the individual shooter a greatly increased rate of fire, were greatly superior to muzzleloaded rifles. In the 1860s, most German states and Russia converted their line infantry and riflemen into 'united' infantry, which used rifles and skirmish tactics. After the Franco-Prussian War, both the German Empire and the French Third Republic did the same. However, Great Britain retained the name "line infantry", although it used rifled muskets from 1853 and breech loading rifles from 1867, and switched from closed lines to extended order during the Boer wars.