C. Julius Caesar, Gallic War

The battle was maintained vigorously on both sides. Our men, however, as they could neither keep their ranks, nor get firm footing, nor follow their standards, and as one from one ship and another from another assembled around whatever standards they met, were thrown into great confusion. But the enemy, who were acquainted with all the shallows, when from the shore they saw any coming from a ship one by one, spurred on their horses, and attacked them while embarrassed; many surrounded a few, others threw their weapons upon our collected forces on their exposed flank. When Caesar observed this, he ordered the boats of the ships of war and the spy sloops to be filled with soldiers, and sent them up to the succor of those whom he had observed in distress. Our men, as soon as they made good their footing on dry ground, and all their comrades had joined them, made an attack upon the enemy, and put them to flight, but could not pursue them very far, because the horse had not been able to maintain their course at sea and reach the island. This alone was wanting to Caesar's accustomed success.