Strategic bombing is the use of airpower to destroy industrial and economic infrastructure—such as factories, oil refineries, railroads, or nuclear power plants—rather than just directly targeting military bases, supply depots, or enemy combatants. Strategic bombing may also include the intent to dehouse, demoralize, or inflict civilian casualties, and thus hinders them from supporting the enemy's war effort. The bombing can be utilized by strategic bombers or missiles, and may use general-purpose bombs, guided bombs, incendiary devices, chemical weapons, biological weapons, or nuclear weapons.