Marxist historiography developed as a school of historiography influenced by the chief tenets of Marxism, including the centrality of social class and economic constraints in determining historical outcomes (historical materialism). Friedrich Engels wrote "The Peasant War in Germany", which analysed social warfare in early Protestant Germany in terms of emerging capitalist classes. Although it lacked a rigorous engagement with archival sources, it indicated an early interest in history from below and class analysis, and it attempts a dialectical analysis. Another treatise of Engels, "The Condition of the Working Class in England in 1844", was salient in creating the socialist impetus in British politics from then on, e.g. the Fabian Society.