Ab urbe condita

Titus Livius (Livy)

Livy. History of Rome, Volumes 1-2. Roberts, Canon, Rev, translator. London, New York: J. M. Dent and Sons; E. P. Dutton and Co., 1912.

Just as he was giving the signal for assault the alarming message reached him from his colleague about the 20 cohorts. This delayed the attack and necessitated the recall of a portion of his troops, who were ready and eager to begin the storm.

He ordered D. Brutus Scaeva, one of his staff, to intercept the hostile reinforcements with the first legion and ten auxiliary cohorts with their complement of cavalry.