These later Roman cataphracts were a much feared force in their heyday. The army of Emperor Nikephoros II Phokas reconstituted Kataphraktoi during the tenth century and included a complex and highly developed composition of an offensive, blunt-nosed wedge formation. Made up of roughly five hundred cavalrymen, this unit was clearly designed with a single decisive charge in mind as the centre of the unit was composed of mounted archers. These would release volleys of arrows into the enemy as the unit advanced at a trot, with the first four rows of mace-armed Kataphraktoi then penetrating the enemy formation through the resulting disruption (contrary to popular representations, Byzantine Kataphraktoi did not charge, they advanced at a steady medium-pace trot and were designed to roll over an enemy already softened by the archers). It is important to note that this formation is the only method prescribed for Kataphraktoi in the Praecepta Militaria of Emperor Nikephoros which was designed as a decisive hammer-blow which would break the enemy. Due to the rigidity of the formation, it was not possible for it to re-form and execute a second charge in instances where the first blow did not smash the enemy (no feigned flight or repeated charges were possible due to the formation employed). It is for this reason that Byzantine military manuals (Praecepta Militaria and the Taktika) advise where possible, for the use of a second wedge of Kataphraktoi to which could be hurled at the enemy in the event that they resisted the initial charge.