France purchased 6,000 Model 1866 rifles along with 4.5 million .44 Henry cartridges during the Franco-Prussian War. The Ottoman Empire purchased 45,000 Model 1866 rifles and 5,000 carbines in 1870 and 1871. These rifles were used in the 1877 Russo-Turkish War, causing much surprise when outnumbered Turks at the Siege of Plevna inflicted many times more casualties than their opponents armed with single-shot Krnka and Berdan rifles. The Model 1866 compelled Russians to develop a new rifle, the Mosin–Nagant, after the war.