The French Resistance executed acts of sabotage on electric power grids.
 The problem of informers, whom the French called indics or mouches, was compounded by the corbeaux (poison pen letters)
 Following the invasions of Normandy and Provence in 1944, the sabotage of rail transport became much more frequent and effectively prevented some German troop deployments to the front and hindered the subsequent retreat of German occupying forces

