An examination of these types of earthworks leads to the conclusion that they were probably tribal enclosures for the safe-guarding of cattle, etc.; that, strictly speaking, they were not military works at all, and, in any case, had no relation to national defence against enemies coming over-sea. One finds in different parts of the country a prevalent tradition that the Romans occupied the more ancient British hill-top strongholds, and the name "Caesar's Camp" is popularly applied to many of them. If such an occupation really took place it was, in all probability, only of a temporary character. These fortifications were not suitable to the Roman method of military operations and encampment, and such archaeological evidences of Roman occupation as have been found point to the presence of domestic buildings, such as at Chanctonbury Ring and Wolstanbury Camp (Sussex) rather than military works. However, the question must not be dismissed as entirely without some foundation in fact, because it was only natural that the Roman invaders who dispossessed the Britons of their fastnesses should themselves have taken temporary possession of the works from which the Britons were driven out. THE ROMAN INVASION OF BRITAIN There is hardly a single detail of the first invasion of Britain by the Romans which has not been the subject of dispute or discussion among historians and antiquaries, but, briefly, it may be stated as highly probable that Caesar left Portus Itius (Boulogne) on 25 August 55 B.C., and landed at or near what is now Deal on the following day. When Caesar found a convenient time for the invasion of Britain, he got together about eighty transports, which he considered would be sufficient for carrying two legions across the channel. Those galleys which he had left he distributed to the questor, lieutenants, and officers of the cavalry. In addition to these ships there were eighteen transports, detained by contrary winds at a port about eight miles off, and these were appointed to carry over the cavalry. A favourable breeze sprang up, and anchor was weighed about one in the morning. The cavalry in the eighteen other transports embarked at the other port. It was ten o'clock when Caesar reached the coast of Britain, where he saw the cliffs covered with the enemy's forces. He speaks of the place as being bounded by steep mountains in a way which clearly describes Dover and the eminences in its neighbourhood, comprising Shakespeare's Cliff, the western and eastern heights, and all the magnificent cliff of precipitous chalk rock which extends to Kingsdown, near Walmer. On such a coast as this, apart from the presence of the enemy, landing was impossible, and Caesar wisely determined to sail eight miles further on, where he found, probably at Deal, a plain and open shore. Caesar's description is most interesting, and may be quoted: