Note 256 — XXXVII THE DUTIES, ACTIVITIES, AND AMUSEMENTS OF THE ROYAL GUARDSMEN

Caltrops were instruments provided with iron prongs and were usually scattered where the enemy’s horsemen were likely to pass, in the hope of maiming the horses. It is evident that they were also used in naval warfare, the purpose being to maim the men on the enemy’s deck. See the Sorö edition, 392.