C. Julius Caesar, Gallic War

The Gauls, after the interval of a day and after making, during that time, an immense number of hurdles, scaling-ladders, and iron hooks, silently went forth from the camp at midnight and approached the fortifications in the plain. Raising a shout suddenly, that by this intimation those who were beseiged in the town might learn their arrival, they began to cast down hurdles and dislodge our men from the rampart by slings, arrows, and stones, and executed the other movements which are requisite in storming. At the same time, Vercingetorix, having heard the shout, gives the signal to his troops by a trumpet, and leads them forth from the town. Our troops, as each man's post had been assigned him some days before, man the fortifications; they intimidate the Gauls by slings, large stones, stakes which they had placed along the works, and bullets. All view being prevented by the darkness, many wounds are received on both sides; several missiles, are thrown from the engines. But Marcus Antonius, and Caius Trebonius, the lieutenants, to whom the defense of these parts had been allotted, draughted troops from the redoubts which were more remote, and sent them to aid our troops, in whatever direction they understood that they were hard pressed.