Strategic bombing is a military strategy used in a total war with the goal of defeating the enemy by destroying its morale or its economic ability to produce and transport material to the theatres of military operations. It is a systematically organized and executed attack from the air which can utilize strategic bombers, long- or medium-range missiles, or nuclear-armed fighter-bomber aircraft to attack targets deemed vital to the enemy's war-making capability. The strategic bombing conducted in World War II was unlike anything the world had seen before. The campaigns conducted in Europe and Asia could involve thousands of aircraft dropping tens of thousands of tons of munitions over a single city. This was essential in defeating Germany in the European Theatre, after the decision to focus on oil refineries and transportation destroyed the German supply system.