Tan So
Encyclopedia
Tan So was a secret military base in central Vietnam
Vietnam
Vietnam – sometimes spelled Viet Nam , officially the Socialist Republic of Vietnam – is the easternmost country on the Indochina Peninsula in Southeast Asia. It is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, and the South China Sea –...

 that was built in the 1880s. It was built up by Tôn Thất Thuyết
Ton That Thuyet
Tôn Thất Thuyết was the leading mandarin of Emperor Tự Đức of Vietnam's Nguyễn Dynasty. Thuyết later led the Can Vuong movement which aimed to restore Vietnamese independence under Emperor Hàm Nghi. He was born on May 12, 1839 in Huế....

, the regent of the Nguyễn Dynasty, in preparation for an uprising against French colonialism.
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