The Thames
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 strong-hold. 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.
