We see that the main idea of the borough was the same as that of the prehistoric or British "camp of refuge," in that it was intended for the defence of society and not of the individual. It was intended to be a place of refuge for the whole countryside. But it was also something much more than this, something which belongs to a much more advanced state of society than the hill-fort.[68] It was a town, a place where people were expected to live permanently and do their daily work. It provided a fostering seat for trade and manufactures, two of the chief factors in the history of civilisation. The men who kept watch and ward on the ramparts, or who sallied forth in their bands to fight the Danes, were the men who were slowly building up the prosperity of the stricken land of England. By studding the great highways of England with fortified towns, Alfred and his children were not only saving the kernel of the British Empire, they were laying the sure foundations of its future progress in the arts and habits of civilised life. CHAPTER III ANGLO-SAXON FORTIFICATIONS--_continued_ The bare list which we have given of the boroughs of Edward and Ethelfleda calls for some explanatory remarks. Let us take first the boroughs of Ethelfleda. WORCESTER.--We have already noticed the charter of Ethelred and Ethelfleda which tells of the building of the burh at Worcester.[69] There appears to have been a small Roman settlement at Worcester, but there is no evidence that it was a fortified place.[70] This case lends some support to the conjecture of Dr Christison, that the Saxons gave the name of _chester_ to towns which they had themselves fortified.[71] The mediæval walls of Worcester were probably more extensive than Ethelfleda's borough, of which no trace remains. CHESTER is spoken of by the _Anglo-Saxon Chronicle_ in 894 as "a waste _chester_ in Wirral." It had undoubtedly been a Roman city, and therefore the work of Ethelred and Ethelfleda here was solely one of restoration. Brompton, who wrote at the close of the 13th century "a poor compilation of little authority,"[72] was the first writer to state that the walls of Chester were enlarged by Ethelfleda so as to take in the castle, which he fancied to be Roman;[73] and this statement, being repeated by Leland, has acquired considerable vogue. It is very unlikely that any extension of the walls was made by the Mercian pair, seeing that the city was deserted at the time when it was occupied by the Danes, only fourteen years before. But it is quite certain that the Norman castle of Chester lay outside the city walls, as the manor of Gloverstone, which was not within the jurisdiction of the city, lay between the city and the castle.[74] A charter of Henry VII. shows that the civic boundary did not extend to the present south wall in his reign. Ethelfleda's borough probably followed the lines of the old Roman castrum.