This is the place where Liu Bocheng and Xiao Yedan used water instead of wine to "make an alliance in blood" during the Red Army's Long March.

The Yi Sea is located in Mianning County, Liangshan Yi Autonomous Prefecture, Sichuan Province, near the Beijing-Kunming Expressway and the Yaxi Expressway (Ya'an to Xichang). There is a plateau lake with beautiful mountains and clear waters - the Yi Sea. There is a lake beside the Yi Sea. Red Army Long March Memorial Hall - "Yihai Alliance Memorial Hall". Yihai Alliance Memorial Hall "Yihai Alliance Memorial Hall" In May 1935, Mao Zedong and others led the Central Red Army and came to Mianning County, Daliang Mountain during the Long March. 20 On the second day, the advance team commander Liu Bocheng and the political commissar Nie Rongzhen led the troops to the vicinity of the Yi Sea to publicize the purpose and the party's ethnic policies to the Yi compatriots, winning the respect and trust of the Yi compatriots for the Red Army. Liu Bocheng, accompanied by Nie Rongzhen, met with the Yi Guoji. The leader of the family branch, Guojiyoda (Xiao Yedan), "made a blood alliance" and became brothers in the Yi Sea. The Red Army helped the Yi people to form the "Guoji (Guoji) Detachment of the Chinese Yi People's Red Army" and was awarded Later, Guojiyoda, who served as the captain of the Guoji (Guoji) detachment, sent the Yi people to escort the Red Army through the Yi District smoothly and help the Red Army cross the Dadu River and fly to the Yellow River. Seizing the Luding Bridge and breaking through the blockade of the Japanese army won a prosperous time. It played an indispensable historical role in smashing Chiang Kai-shek's attempt to force the Red Army to repeat Shi Dakai's mistakes. "The Yihai Alliance" is the basis for national unity and military-civilian unity. A model, the victory of the Chinese Communist Party’s ethnic policy, and a glorious page in the history of the Red Army’s Long March. Today, the “Yihai Alliance Memorial Hall” is a cultural relic protection unit in Sichuan Province and a patriotic education base in Liangshan Prefecture. It is the "National Defense Education Demonstration Base" named by the "National Defense Education Office".