Please let me know if you find any errors, or if you know of a link that should be included!
It was written by Ilya Alekseevitch Shatrov () (1885-1952). He was a military band leader, who wrote the tune after the bloody battle of Mukden (Shenyang) in February 1905. He dedicated it to his fallen collegues (the original title was "The Mokshansk legion on the hills of Manchuria"), and words were added by C. Petrova (Skitaltsa), about the graves on the hills -- they can be found on the Shatrov page above. (thanks to Kerstin Bjorn for telling me that Shatrov was the composer)