"Since, furthermore, it was in late-medieval and early modern Europe that new techniques of warfare occurred more frequently than elsewhere, it was not implausible that one such breakthrough could enable a certain nation to dominate its rivals. Already the signs pointed to an increasing concentration of military power. In Italy the use of companies of crossbowmen, protected when necessary by soldiers using pikes, had brought to a close the age of the knight on horseback and his accompanying ill-trained feudal levy; but it was also clear that only the wealthier states like Venice and Milan could pay for the new armies officered by the famous condottieri. By around 1500, moreover, the kings of France and England had gained an artillery monopoly at home and were thus able, if the need arose, to crush an overmighty subject even if the latter sheltered behind castle walls. But would not this tendency finally lead to a larger transnational monopoly, stretching across Europe? This must have been a question many asked around 1550, as they observed the vast concentration of lands and armies under the Emperor Charles V."