This study reexamines a covert factor of the colonization of Myanmar kingdom, drawing on the case of Myingyun-MyingonDaing Rebellion broke out in 1866. It criticizes that existing discussions on the downfall of the Konbaung dynasty are preoccupied with post-colonialism. These researches were focus on macro level and pointed out the imperialist stratagem and many scholars concluded for the down fall of Konbaung Dynasty that the wave of Imperialism as Sunami hit from Europe to Asia so that Myanmar could not stand as feudal society and down fall Konbaung Dynasty. All of events and comments were quite true but it is necessary to examine carefully past events. There were many controversial facts about third Anglo-Myanmar war. This paper has pointed out the Kings Mindon's false political strategic due to the lack of awareness on external threat with the giving the best example of Myingun-MyingonDaing rebellion.