The Oroqen, Evenki, and Nanai during the warlord era?

[Sawpatin]

Is anyone here aware of any sources that discuss these three communities during the warlord era? For example, did any Oroqen, Evenki, or Nanai men end up serving in warlord armies during the ca. 1916-28 period? What about during the Sino-Soviet War in 1929? What sorts of policies did the Fengtien Clique and other regional authorities take towards these communities with regards to things like land rights, economic privileges or restrictions, etc.?

[Manchukuo_1940]

Here is a link that gives historical background to the Oroqens treatment in Manchukuo.

https://en.m.wikipedia.org/wiki/Manchuk ... minorities