Even after Cromwell had come forward as the chief leader, in fact if not in name, the apparent losses are largely increased by the random massacres to which his soldiers were unfortunately addicted. Thus after Naseby a hundred women were killed for no particular reason except that killing was in the air, and similarly after Philiphaugh the conscience of the Puritans forbade them to keep their word to the prisoners they had taken, who were put to the sword in cold blood: the women, however, on this occasion, were drowned. After the Civil Wars all the military meaning of the Thames disappears. Nor is it likely to revive short of a national disaster; but that disaster would at once teach us the strategical meaning of this great highway running through the south of England with its attendant railways, it would re-create the strategical value of the point where the Thames turns northward and where its main railways bifurcate; it would provide in several conceivable cases, as it provided to Charles I. and to William III., the line of approach on London. * * * * * So far as we have considered the Thames, first as a line of pre-historic settlements, passing successively into the Roman, the barbaric and the Norman phases of our history; and secondly, as a field on which one can plot out certain strategical points and show how these points created the original importance of the towns which grew about them. In the next part of these notes I propose to consider the economic or civil development of the Thames above London, and to show how the foundations of its permanent prosperity was laid. That economic phenomenon has at its roots the action of the Benedictine Order. It was the great monasteries which bridged the transition between Rome and the Dark Ages throughout North-Western Europe; it was they that recovered land wasted by the barbarian invasions, and that developed heaths and fens which the Empire even in its maturity had never attempted to exploit.