elli us , ▁the ▁Pra et ori ans ▁were ▁rest rained ▁following ▁defeat ▁and ▁their ▁cent ur ions ▁executed . ▁They ▁were ▁replaced ▁by ▁ 1 6 ▁coh ort s ▁rec ru ited ▁from ▁the ▁leg ion na ires ▁and ▁auxili aries ▁loyal ▁to ▁Vit elli us , ▁almost ▁ 1 6 , 0 0 0 ▁men . ▁These ▁ex - P ra et ori ans ▁then ▁a ided ▁V esp as ian , ▁the ▁fourth ▁Emperor , ▁leading ▁the ▁attack ▁against ▁the ▁Pra et or ian ▁camp . ▁ ▁F lav ian ▁dynast y ▁ ▁Under ▁the ▁F la vi ans , ▁the ▁Pra et ori ans ▁formed ▁ 9 ▁new ▁coh ort s , ▁of ▁which ▁Tit us , ▁son ▁of ▁the ▁em peror ▁V esp as ian , ▁became ▁the ▁pre fect . ▁V esp as ian ▁returned ▁the ▁effective ▁strength ▁of ▁each ▁unit ▁to ▁five ▁hundred ▁men . ▁He ▁also ▁cancel led ▁the ▁guard ▁service ▁of ▁the ▁Pra et ori ans ▁at ▁the ▁entry ▁to ▁the ▁em peror ' s ▁palace , ▁but ▁retained ▁gu ards ▁within ▁the ▁palace ▁itself . ▁ ▁Under ▁V esp as ian ' s ▁second ▁son , ▁Dom it ian , ▁the ▁number ▁of ▁coh ort s ▁was ▁increased ▁to ▁ 1 0 , ▁and ▁the ▁Pra et or ian ▁Guard ▁participated ▁in ▁fighting ▁in ▁Germania ▁and ▁on ▁the ▁Dan ube ▁against ▁the ▁Da ci ans . ▁It ▁was ▁in ▁the ▁course ▁of ▁these ▁actions ▁that ▁the ▁pre fect ▁Corn el ius ▁F us