To identify history's deadliest weapons, <a href="https://247wallst.com/" target="_blank">24/7 Wall St. </a> reviewed a report called "Quantification Related to Weapon Lethality,” originally issued in 1964 by the Historical Evaluation and Research Organization for the U.S. Army Combat Developments Command. It rates the lethal potential of various weapons on such quantifiable measures as number of potential targets per strike, relative effect, effective range, accuracy, reliability, and mobility.