Note 1128 — Chapter VIII · HENRY DUKE OF THE NORMANS. 1149–1154.
Reading edition
“Petroritas, fundibularias, mangonellos et arietes,” Hist. Gaufr. Ducis (Marchegay, Comtes), p. 285, and “sex tormenta quæ vulgo perreriæ vocantur.” Chron. S. Serg. (as above), p. 147.