290 A BRIEF SURVEY OF HUMAN HISTORY good service then, was not without its defects. Private warfare was one of its most outstanding evils. This acted as the enemy of all established order. " The man's man was not the lord's man " was the principle which obtained in the continent of Europe. Hence, however powerful a lord might consider himself in theory, he could not in practice depend upon the co-ordinated loyalties of all who shared his lands. Very often the vassals proved stronger than their masters, and well integrated national kingdoms could not arise under such circumstances. To this England was the earliest exception. On account of her geographical isolation she could develop well along her own lines. The Normans under William the Conqueror, profiting by continental ex- perience, tried to counteract the feudal anarchical tendencies by insisting upon all classes of vassals that they could swear allegiance to their immediate superiors only " saving the faith that I owe to our lord the King." Yet the centrifugal forces continued to assert themselves, though with diminishing effect, until the establishment of the strong Tudor monarchy in the fifteenth century. On the continent feudalism was liquefied only gradually. It vanished, however, in the wake of the invention of gun-powder, the growth of commercial towns, and above all of the Renaissance. But it is not to be for- gotten that in its own time it had functioned well " as a military measure to organise local defence; economically, to safeguard cultivation of the soil; and politically, to provide machinery for local administration of justice."1 Its moral and cultural influences were also considerable. It gave courage to the barons in 1215 to extort the Magnn Carta from King John of England, and its traditions of gallantry and romance 1. A. F. Hattersley, A Short History of Western Civilization, p. 62.