The emergency that confronted the nation with the onset of civil war overwhelmed the productive capability of Springfield Armory. The federal armories simply could not manufacture enough weapons to outfit the thousands of soldiers quickly filling the ranks of Union armies. This situation was worsened with the loss of the armory at Harpers Ferry. Outside help was needed, and the government procured the assistance of private manufacturers. Springfield Armory provided technical assistance so that these contract weapons essentially conformed to the “government model” of the .58 caliber rifle musket. These weapons, as opposed to the numerous pistols and carbines that were purchased on contract, differ basically only in the markings on their lockplates.