I already found him, eh, well the book!
His name was Baron Roman von Ungern-Sternberg. He was born in Graz, Austria, on Januari 10 1886. But his family owned many lands in the Baltic states, dating back to the Teutonic Order, so he moved there. He already fought in the Russian-Turkish was of 1877-1878. Then he went to a madhouse in 1899 (cool, hahaha). In 1903 he went to a navy school. And in 1904 he fought against Japan. He then became an officer with the Cossacks. He was fired, because of a fight he had with another officer, whom gave him a big scar in the face with the slash of a sable.
He wandered the forests of Manchuria, living of the hunt. In 1911 a little war broke out between Mongolia and China. He offered his services to the Mongolians and became the commander of the cavalry.
In the WW1 he became an officer for the Cossacks again and fought many battles with them. With the Revolution he went back to Mongolia fighting against the Red Army. Mongolia was however occupied by the Chinese. He defeated them and then became the reincarnation of the Kahn, in Mongolian eyes. He then wanted to build a big Asian state with the Mongolians as leaders to fight off the commies and even the Germans (it was still 1917). With the white army of Russians and the Mongolian cavalry he went to fight the Red Army, but was then defeated and then all the things in my last post happened.
In the book there are also stories about him, how he would crawl to the German side, cutting barbwire underway, and singlehandedly brought back German prisoners. How far this is true, we don't know of course, but the myth is cool, anyway!