The largest unit was the tumen, equivalent to a division: 10,000 men in principle (and sometimes less). An army was made up of two to four tumen, each composed of ten times a thousand men (the equivalent of a regiment), and each regiment of ten times a hundred men (the equivalent of a squadron), ten times ten men.
Source: wiktionary
Another tribe, the Kwiara, live on the frontiers of Korea, on the north bank of the Tumen river, and these are probably also Orochi.
Source: wiktionary
The Tumen river separates Corea from Manchooria, except in the last few miles of its course, when it flows by Russian territory, the south-eastern corner of Siberia.
Source: wiktionary
The Tumen is not yet so important as the Yalu, but with the development of a rival to Vladivostock, now a closed port, in Hunchun, it is acquiring greater importance.
Source: wiktionary
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