This book, first published in 1973, examines the period when wars, famines and epidemics bred widespread conflicts, culminating in the revolutionary years of 1378–82 with the Florentine 'Ciompi', revolts in Flanders and France and the risings among English labourers. The analysis ends with the Hussite crisis which gave the movement a new aspect. The troubles were varied, with hunger riots in cities and brigandage in the country, open struggles between lords and peasants, urban conflicts over municipal power, and labour conflicts over pay and hours.