the Japanese. [ edit ] Early conquest by Imperial army AD 658: Abe no Hirafu 's naval expedition of 180 ships reaches Aguta (present day Akita ) and Watarishima (Hokkaidō). Alliance with Aguta Emishi, Tsugaru Emishi and Watarishima Emishi is formed by Abe who then storms a settlement of Mishihase (Su-shen