John K. Mahon and Romana Danysh, CMH 60-3: Infantry, Part I: Regular Army…
“ All the changes, whether in organization or techniques, stemmed from the growing deadliness of firearms. A weapon that would change the character of warfare, the machine gun, was being developed during this period. The first important model, the Gatling gun patented in 1862, was purchased by the United States during the Civil War. Tests made in the 1870's showed the Gatling to be equal to seventy Springfield rifles well aimed at 150 to 200 yards. Interest in the weapon increased and the United States bought several lots of it in the years after the Civil War. ”
