The conflict has been compared to World War I in terms of the tactics used, including large-scale trench warfare with barbed wire stretched across fortified defensive lines, manned machine gun posts, bayonet charges, Iranian human wave attacks, extensive use of chemical weapons by Iraq, and, later, deliberate attacks on civilian targets. A special feature of the war can be seen in the Iranian cult of the martyr which had been developed in the years before the revolution. The discourses on martyrdom formulated in the Iranian Shiite context led to the tactics of "human wave attacks" and thus had a lasting impact on the dynamics of the war.[6]