Revolutions, which were usually spontaneous until the mid-nineteenth century, later became carefully planned. Louis Napoleon's coup served as an important example for this. Revolutionaries began focusing mostly on the technique of seizure of power; this included a considerable share of companions and allies. Revolutions usually became connected with the social catastrophe mostly brought by war between countries. Such a paradigm of revolution became a model within the communist movement in the first half of the 20th century.