The English people were disarmed. Curfew bells were rung at 7:00 PM when everyone had to remain in their own dwellings on pain of death and all fires and candles were to be put out, This prevented any nightly gatherings, assassinations, or seditions. Order was brought to the kingdom so that no man dare kill another, no matter how great the injury he had received. William extended the King's peace on high roads to include the whole nation. Any individual of any rank could travel from end to end of the land unharmed. Before, prudent travelers would travel only in groups of twenty. The barons subjugated the English who were on their newly acquired land. There began a hierarchy of seisin [rightful occupation] of land so that there could be no land without its lord. Also, every lord had a superior lord with the King as the overlord or supreme landlord. One piece of land may be held by several tenures. For instance, A, holding by barons's service of the King, may enfeoff B, a church, to hold of him on the terms of praying for the souls of his ancestors, and B may enfeoff a freeman C to hold of the church by giving it a certain percentage of his crops every year. There were about 200 barons who held land directly of the King. Other fighting men were the knights, who were tenants or subtenants of a baron. Knighthood began as a reward for valor on the field of battle by the King or a noble. Altogether there were about 5000 fighting men holding land. The essence of Norman feudalism was that the land remained under the lord, whatever the vassal might do. The lord had the duty to defend the vassals on his land. The vassal owed military service to the lord and also the service of attending the courts of the hundred and the shire, which were courts of the King, administering old customary law. They were the King's courts on the principle that a crime anywhere was a breach of the King's peace. This feudal bond based on occupancy of land rather than on personal ties was uniform throughout the realm. No longer could a man choose his lord and transfer his land with him to a new lord. He held his land at the will of his lord, to be terminated anytime the lord decided to do so. In later eras, tenancies would be held for the life of the tenant, and even later, for his life and those of his heirs. This uniformity of land organization plus the new requirement of every freeman to take an oath of loyalty directly to the King that would supersede any oath to any other man gave the nation a new unity.