Popular Resistance in the French Wars

In the Napoleonic period warfare ceased to be a matter for armies alone, but also became an affair of the people. So, at least, runs the usual claim. In Spain, Portugal, Italy, Germany and Russia outraged peasants and townsfolk rose against the French armies and fell upon them without mercy. From these insurrections we get the modern word ''guerrilla'', but did armed civilians really play an impor...