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.
Wherever he fell in with them he was to hold them and stop their advance; if circumstances should make it necessary he was to offer them battle; in any case he was to prevent those troops from reaching Cominium.
Then he went on with his preparations for the assault. Orders were issued for scaling ladders to be reared against the walls in all directions and an approach made to the gates under a shield roof. Simultaneously with the smashing in of the gates the storming parties clambered up on the walls on every side.