Titus Livius (Livy), The History of Rome, Book 35
Cyrus Evans, Ed.

3. In Italy the war, commenced by the Ligurians, grew daily more formidable. They now invested Pisae, with an army of forty thousand men; for multitudes flocked to them continually, led by the reports of the war and the expectation of booty. The consul, Minucius, came to Arretium, on the day which he had fixed for the assembling of the troops. [2] Thence he led them, in order of battle, towards Pisae; and though the enemy had removed their camp to the other side of the river at a distance of no more than three miles from the place, the consul marched into the city, which evidently owed its preservation to his coming. [3] Next day he also encamped on the other side of the river, about a mile from the enemy; and by slight skirmishes protected the lands of the allies from their depredations. [4] He did not think it prudent to hazard a general engagement, because his troops were raw, composed of many different kinds of men, and not yet so well known among themselves that they could rely on one another. [5] The Ligurians depended so much on their numbers, that they not only came out and offered battle, willing to risk every thing on the issue of it; but, from their superfluity of men, they sent out many parties along the frontiers to plunder; [6] and whenever a large quantity of cattle, and other prey, was collected, there was an escort always in readiness to convey it into their forts and towns. [p. 1556]