It has often been remarked with surprise that cities and strongholds once densely inhabited and heavily built can disappear and leave no material trace to posterity. That they do so disappear should give pause to those historians who are perpetually using the negative argument, and pretending that the lack of material evidence is sufficient to disturb a strong and early tradition. Those who have watched the process by which abandoned buildings become a quarry will easily understand how all traces of habitation disappear. Three-quarters of what was once Orford, much of what once was Worsted, has gone, and up and down the country-sides to-day one could witness, even in our strictly disciplined civilisation, the removal, by purchase or theft, of abandoned material.

The whole of Wallingford has suffered this fate—the mound, presumably artificial, upon which the first keep stood, and which was, probably, a palisade mound of Anglo-Saxon times, remains, but there is upon it no remaining masonry.

Next down stream of the points with a strategic importance in English history comes Reading. But the strategic importance of Reading was not produced by the town's possessing a site of national moment: it was produced only by local topography. Reading was never (to use a modern term) a "nodal point" in the communications of England.

It may be generally laid down that mere strength of position is noted and greedily seized in barbaric times alone. For mere strength of position is a mere refuge. A strong position (I do not speak, of course, of tactical and temporary, but of permanent, positions), chosen only because it is strong, will save you during a critical short period from the attack of a fierce, unthoughtful, and easily wearied enemy—such as are all barbarians; but it cannot of itself fall into a general scheme of defence, nor, simply because it is strong, intercept the advance of an adversary or support a line of opposition and resistance. Position is always of advantage to a fortress, and, in all but highly civilised times, a necessity—as we shall see when we come to discuss Windsor—but it is not sufficient. A fortress, when society is organised, and when the feud of one small tribe or family against another is not to be feared, derives its principal value from a command of established communications, and established aggregations of power—especially of economic power. Towns alone can feed and house armies; by roads and railways alone can armies proceed.

There are, indeed, examples of a chain of positions so striking that, from their strength alone, a strategic line imposes itself; but these are very rare. Another, and much commoner, exception to the rule I have stated is the growth of what was once a barbaric stronghold, chosen merely for its position, into a larger centre of population, through which communications necessarily lead, and in which stores and other opportunities for armies can be provided. Such places often preserve a continuity of strategic importance, from civilised, through barbaric, to civilised times again. Laon is an excellent instance of this, and so is Constantine another, and so is Luxembourg a third—indeed they are numerous.

But, in spite of—or, rather, as is proved by—these exceptions the fortresses of an organised people are found at the conjunction of their communications, or at places (such as straits or passes) which have the monopoly of communication, or they are identical with great aggregations of population and opportunity, or at least they are situated in spots from which such aggregations can be commanded. Position is always of value, but only as an adjunct.

Now Reading, save, perhaps, in barbaric times, when the Thames was the main highway of Southern England, occupied no such vantage until the nineteenth century. To-day, with its large population, its provision of steam and electrical power, and above all, its command of the main junction between the southern and middle railways, Reading would again prove of primary strategic importance if we still considered warfare with our equals as a possibility. But during all previous centuries, since the Dark Ages, Reading was potentially, as it is still actually, civilian; and, indeed, it is as the typical great town of the Thames Valley that it will be treated later in these pages.

The long and narrow peninsula between the Kennet and the Thames was an ideal place for defence. It needed but a trench from the one marsh to the other to secure the stronghold. But though this was evident to every fighter, though it is as such a stronghold that Reading is mentioned first in history, yet the advantage was never permanently held. Armies hold Reading, fall back on the town, fight near it, and raid it: but it is never a great fortress in the intervals of wars, because, while Oxford commanded the Drovers' Road, Wallingford the western road, and Windsor (as we shall see in a moment) London itself, Reading neither held a line of supply nor an accumulation of supply, and was, therefore, civilian, though it was nearly as easy to hold as Windsor, as easy as Dorchester, its parallel, easier than Oxford, and far easier than Wallingford, which had, indeed, no natural defences whatsoever.

Proceeding with the stream, there is no further stronghold till we come to Windsor.

Even to-day, and in an England that has lost hold of her past more than has any rival nation, Windsor seems to the passer-by to possess a meaning. That hill of stones, sharp though most of its modern outlines are, set upon another hill for a pedestal, gives, even to a modern patriot, a hint of history; and when it is seen from up-stream, showing its only noble part, where the Middle Ages still linger, it has an aspect almost approaching majesty.