The correct sequence of the event is following:
3,4,1,5,2 (Egypt and Ku-sh develop and interdependent trade relationship, Egypt conquered Ku-sh, Ku-sh conquered Egypt, Assyrians conquered Ku-sh in Egypt, Ku-sh and Egypt continue to to develop independently of each other).
Egypt and Ku-sh both traded with each other. Though, the relationship between them became hostile. Soon Egypt became worried that ku-sh can cause political harms to Egypt. Therefore, Egypt attacked and conquered Ku-sh. Ku-sh then became the territory of Egypt for about 450 years. During the course of the time, the decline of Egypt led the Kush-ite leaders to gain authority of Ku-sh. The leaders of Ku-sh after gaining freedom, Conquered the empire of Egypt. The dynasty of Ku-sh entertained all the political privileges in Egypt until the Assyrians overpowered them in Egypt. As a result of this, Ku-sh and Egypt maintain to grow autonomously.
