 He wrote an introduction emphasising the historical significance of the experience of the Paris Commune, its theoretical generalization by Marx in "The Civil War in France" and providing additional information on the activities of the Communards from among the Blanquists and Proudhonists.Engels also decided to include earlier material by Marx made for the International, providing additional historical background to the Commune from Marx's account of the Franco-Prussian War.For Marx, the history of the Paris Commune caused him to reassess the significance of some of his own earlier writings.