Another social institution which was beginning to make its influence felt at the time under discussion was the feudal system. Hitherto, civilized Europe had depended for offensive and defensive operations on large slow-moving armies of foot-folk; these were ineffective against marauding barbarians, Vikings in their sharp-prowed ships, or the light cavalry of Hungarian or Saracen. Moreover, the governmental system organized by Charlemagne had fallen to pieces, and there was no central power to order the movements of a large army. Luckily for the cause of Christendom and western civilization such as it was, the subordinates of Charles's successors hit upon the right tactics to employ against the invaders. The nominal subordinates, Counts of the Marches, burgraves, barons, took a very free hand in those days of decentralized authority and bad lines of communication. Based on impregnable strongholds, they met the swiftly moving hosts of marauders with equally mobile troops of mailed horsemen, raised, trained and paid by themselves, and bound to their feudal lords by the ties of discipline out of which grew the tradition of military servitude. It was these feudal lords and their mailed horsemen who saved Western Europe; they took their own reward out of the lands they saved and out of the neighbours whom they insisted on saving, till they eventually became an unmitigated nuisance from which Bohemia suffered as much as any other country. But for the moment we are concerned with the times of St. Wenceslaus and the first half of the tenth century.