Investigating of the Defensive Considerationsin the istorical Cities of Iran, Case Study: the Old Texture of Dezful

The particular position and special characteristics of Iranian geography toward great powers since a long time ago, have led Iranian governments to consider the importance of creating military and defensive positions. Dezful texture has been created during Sasani dynasty and has survived until now. This study tries to investigate the way of using passive defense in historical cities of Iran, including Dezful.the study has used historical and descriptive-analytical method; acquiring historical information and documents through documentary and librarian methods. The results show that that choosing the location of historical cities of Iran including old texture of Dezful has been carried outin a way that by relying on surrounding facilities and the least costs kept the city away of enemie's access. This job was done in a way that natural possibilities were used and also it was according to human-made components of passive defense likemoats and forts.