C. Julius Caesar, Gallic War

Being on the same day informed by his scouts, that the enemy had encamped at the foot of a mountain eight miles from his own camp; he sent persons to ascertain what the nature of the mountain was, and of what kind the ascent on every side. Word was brought back, that it was easy. During the third watch he orders Titus Labienus, his lieutenant with praetorian powers, to ascend to the highest ridge of the mountain with two legions, and with those as guides who had examined the road; he explains what his plan is. He himself during the fourth watch, hastens to them by the same route by which the enemy had gone, and sends on all the cavalry before him. Publius Considius, who was reputed to be very experienced in military affairs, and had been in the army of Lucius Sulla, and afterward in that of Marcus Crassus, is sent forward with the scouts.