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The purpose of the assay is to identify and explain in which extent the application of Friedman's nine principles of success in war is affected by the variables: Enemy and Terrain, in the Battle of Okinawa and in the Battle of Inchon, respectively. 

The results demonstrate the importance of managing variables such as Enemy and Terrain to achieve success in operations that begin with an amphibious assault. The Battle of Okinawa lacks a large proportion of Friedman's nine principles both during the amphibious assault and during the latter part of the operation, while Inchon fulfills almost all of them throughout the operation. The reason for this difference is how the United States was forced to act tactically based on the enemy and the terrain.  

The study is a positive, qualitative, comparative case study, that uses a most similar design to detect the difference between the two cases. As dependent variables, Friedman's nine principles, i.e. Maneuver, Mass, Firepower, Tempo, Deception, Surprise, Confusion, Shock and Moral Cohesion, were used. As non-dependent variables the success factors Enemy and Terrain, defined by Clausewitz and Leonhard respectively, were used.