My presentation deals with the economic effects that decisive naval battles have brought in the lives of pirates and corsairs of the Seto Inland Sea from the mid sixteenth century. I am analyzing the effect that such battles had on the economic lives of piratical villages in Southern Shikoku and Northern Kyushu by looking at major naval battles between the Kurushima and Noshima Murakami clans, corsairs for the Mori daimyo, and the corsairs of the Otomo daimyo who sought to expand in the same maritime shores and islands. Current Japanese and Western historians tend to de-emphasize the fact that most of these maritime forces fought fiercely against enemies that posed major threats to their livelihood, and they have been re interpreted mainly as maritime security patrol forces, whose intent was to promote a peaceful environment, without really taking into consideration the politics of the time and particularly the web of interconnected alliances and economic interests that such alliances brought with them. Therefore my aim is to show that their military prowess and naval capability secured a certain degree of authority and control over shores and islands granting them economic stability, without which their lives could not have been sustained. By analyzing the naval battles that took place between such naval forces, superficially tight to local power holders such as the sengoku daimyo, i intend to demonstrate that their ultimate goal was instead their own survival and economic stability which could be obtained only with their naval skills capability during wartime.