Tolong jelaskan mengenai Prelude dari Pemberontakan Saga

Etō Shimpei, former Justice Minister and sangi (Councilor) in the early Meiji government resigned his posts in 1873 to protest the government's refusal to launch a military expedition against Korea (Seikanron). Eto then assisted Itagaki Taisuke in organizing the Aikoku Kōtō political party, and in composing the Tosa Memorial, a sharp criticism of the government. In January 1874, frustrated by the government's rejection of his efforts, he returned to his native Saga where both the traditionists and the Seikantō samurai rallied to his support.

Alarmed by growing rumors of unrest, Home Minister Ōkubo Toshimichi dispatched his henchman Iwamura Takatoshi to Saga to restore order. Iwamura only made the situation worse with his overbearing attitude. On the ship to Saga, he made an enemy of Shima Yoshitake, the former governor of Akita Prefecture, who was traveling to Saga at the request of Sanjō Sanetomi. Iwamura so outraged Shima that Shima decided to throw his lot in with Etō and his rebels.