In this first expedition into Britain, Cæsar did not make, nor indeed could he expect, any considerable advantage. He acquired a knowledge of the sea-coast, and of the country contiguous to it; and he became acquainted with the force, the manner of fighting, and the military character of the people. To compass these purposes he did not think a part of the summer ill-bestowed. But early in the next he prepared to make a more effective use of the experience he had gained. He embarked again at the same port, but with a more numerous army. The Britons, on their part, had prepared more regularly for their defence in this than the former year. Several of those states which were nearest and most exposed to the danger had, during Cæsar's absence, combined for their common safety, and chosen Cassibelan, a chief of power and reputation, for the leader of their union. They seemed resolved to dispute the landing of the Romans with their former intrepidity. But when they beheld the sea covered, as far as the eye could reach, with the multitude of the enemy's ships, (for they were eight hundred sail,) they despaired of defending the coast, they retired into the woods' and fastnesses, and Cæsar landed his army without opposition. The Britons now saw the necessity of altering their former method of war. They no longer, therefore, opposed the Romans in the open field; they formed frequent ambuscades; they divided themselves into light flying parties, and continually harassed the enemy on his march. This plan, though in their circumstances the most judicious, was attended with no great success. Cæsar forced some of their strongest intrenchments, and then carried the war directly into the territories of Cassibelan. The only fordable passage which he could find over the Thames was defended by a row of palisadoes which lined the opposite bank; another row of sharpened stakes stood under water along the middle of the stream. Some remains of these works long subsisted, and were to be discerned in the river[6] down almost to the present times. The Britons had made the best of the situation; but the Romans plunged into the water, tore away the stakes and palisadoes, and obtained a complete victory. The capital, or rather chief fastness, of Cassibelan was then taken, with a number of cattle, the wealth of this barbarous city. After these misfortunes the Britons were no longer in a condition to act with effect. Their ill-success in the field soon dissolved the ill-cemented union of their councils. They split into factions, and some of them chose the common enemy for their protector, insomuch that, after some feeble and desultory efforts, most of the tribes to the southward of the Thames submitted themselves to the conqueror. Cassibelan, worsted in so many encounters, and deserted by his allies, was driven at length to sue for peace. A tribute was imposed; and as the summer began to wear away, Cæsar, having finished the war to his satisfaction, embarked for Gaul.