One of the branches of service to benefit most from Nader's reforms was by far the artillery. During the reign of the Safavid dynasty gunpowder weapons were used to a relatively limited extent and were certainly not to be considered central to the Safavid military machine. Although most of Nader's military campaigns were conducted with an aggressive speed of advance which brought up difficulties in keeping up the heavy guns with the army's rapid marches, Nader placed great emphasis on enhancing his artillery units.