Groups of armed men took lands, manors, goods, and women by force. The villeins agreed to assist each other in resisting by force their lords' efforts to return them to servitude. A statute of laborers passed in 1351 for wages to be set at the pre-plague rates was ineffectual. Justices became afraid to administer the law. Villeins, free peasants, and craftsmen joined together and learned to use the tactics of association and strikes against their employers. The office of Justice of the Peace was created for every county to deal with rioting and vagrants. Cooperation by officials of other counties was mandated to deal with fugitives from its justice. The Black Death visited again in 1361 and in 1369. The Black Death reduced the population from about 5 million to about 2 1/2 million. It was to rise to about 4 million by 1600. When there were attempts to enforce the legal servitude of the villeins, they spread rhymes of their condition and need to revolt. A secret league, called the "Great Society" linked the centers of intrigue. A high poll tax, graduated from 20s. to 12d., that was to be raised for a war with France, touched off a spontaneous riot all over the nation in 1381. This tax included people not taxed before, such as laborers, the village smith, and the village tiler. Each area had its own specific grievances. There was no common political motive, except maladministration in general. In this Peasants' Revolt, mobs overran the counties around London. The upper classes fled to the woods. Written records of the servitude of villeins were burned in their halls, which were also looted. Title deeds of landlords were burned. Rate rolls of general taxation were destroyed. Prisoners were released from gaols. Men connected with tax collection, law enforcement, attorneys, and alien merchants were beheaded. The Chief Justice was murdered while fleeing. The archbishop, who was a notoriously exploitive landlord, the chancellor, and the treasurer were murdered. Severed heads were posted on London Bridge. A mob took control of the king's empty bedchamber in the Tower. The villeins demanded that service to a lord be by agreement instead of by servitude, a commutation of villein service for rents of a maximum of 4d. per acre yearly, abolition of a lord's right for their work on demand (e.g. just before a hail storm so only his crops were saved), and the right to hunt and fish. The sokemen protested having to use the lord's mill and having to attend his court.