A Smart Defensive Military Tactic

If an army starts to invade a country, the least thing that the invaded can do is the following. Plough the land that the invader is going to walk through in order to take hold of strategic places. By doing that, you will exhaust the troops, delay their arrival and distabalize them psychologically. The toops will not be as confident as they were when the operations stareted. A similar tactic was coducted by The British War Office in World War II when it burnt the seashores to prevent the Germans from getting in. If the soldiers reached the English shorelines, they would be burnt alive.