Classical Marxist elitism and condescension. I still wouldn't put much stock into Marx's views, especially since the French lost the war due to a combination of Napoleon III's incompetence and Prussian organizational superiority and tactical brilliance. Besides, this isn't going to be a true Marxist struggle. They've already got the apparatchiks and agitprop to whip the urban poor into a motivated and fanatical fighting force. The only thing they lack is a strong industrial base with which to prosecute the war, unlike the Roundheads or the Bolsheviks, but the difficulties of urban warfare versus rural fighting make it a lot easier to occupy rural areas, as opposed to trying to capture a densely populated urban area.