bleh? ... no mention of when you ask about and such.
Top of my head would be you trying to ask about Meiji restoration having the Tokugawa shogunate win over the Satsuma-Chōshū Alliance whom had conquered Kyoto and 'forced' the Emperor to place his symbolic authority behind them.
5-10 years at most ... the Shogun had to fight an uphill battle on several fronts and was forced to win all but the most minor skirmish (and even then it's questionable), or his position would collaspe