Next as to the keeping guard at night. The Consul’s tent is guarded by the maniple on duty: those of the Tribuni and praefects of the cavalry by the pickets formed as described above from the several maniples. And in the same way each maniple and squadron posts guards of their own men. The other pickets are posted by the Consul. Generally speaking there are three pickets at the Quaestorium, and two at the tent of each of the legati or members of council. The vallum is lined by the velites, who are on guard all along it from day to day. That is their special duty; while they also guard all the entrances to the camp, telling off ten sentinels to take their turn at each of them. Of the men told off for duty at the several stationes, the man who in each maniple is to take the first watch is brought by the rear-rank man of his company to the Tribune at eventide. The latter hands over to them severally small wooden tablets ( tesserae ), one for each watch, inscribed with small marks; on receiving which they go off to the places indicated.