 Liu's assumption of the presidency stiffened the will of ordinary Formosans to resist the invaders.The result was a perceptible growth in guerrilla activity against the Japanese, and as the month of June wore on it became clear that all the island's main towns would have to be occupied forcibly before opposition to the Japanese invasion collapsed.From now on, the capture of Tainan became a political as well as a strategic imperative for the Japanese.