Scorched Earth (disambiguation)
Scorched earth is the military strategy or operational policy of destroying everything useful to the enemy in areas that cannot be defended.
Flying column
In the 1920s Defence Scheme No. 1, the proposed Canadian response to an invasion by the United States, Lt. Col. James "Buster" Brown suggested "immediate dispatch of flying columns on the declaration of war" in order to counter-invade across the border and enact a scorched earth policy, forcing the USA to divert military resources towards the defense of its northern cities.