Traditionally, the term War referred to the physical and conventional act of engaging in armed conflict. However, the implications of what war entails has evolved over time. The War on Terror has often been cited as a perpetual war, being a war with “no specific battlefield and the enemy isn’t an army”. The War on Terror has been directed at countless 'enemies' as it has no clear target. Georgetown University Historian Bruce Hoffman describes traditional war as a war that "ends with the vanquishing of an opponent, with some form or armistice or truce- some kind of surrender instrument or document". In contrast, The War on Terror continues to rage on, with no end in sight.