Mezue ahịrịokwu na-esonụ: Site na 1903, Mischchenko bụ ọchịagha nke Trans-Baikal Cossack Brigade. N'oge agha Russia na Japan nke 1904-1905, o duziri ndị ọzọ dị iche iche East-Baikal Cossack Brigade, nke na-arụsi ọrụ ike n'ọtụtụ agha nke agha ahụ. Na mbido, ndị agha ya nọ na Korea, na ntuziaka iji gbochie mbata nke ndị agha mbụ nke Japan na njem ya na Manchuria. Otú ọ dị, mgbe ọtụtụ obere ọgụ gasịrị, Mischchenko laghachiri n'ofe Osimiri Yalu. O nwere obere ọrụ n'akụkụ nke Agha Osimiri Yalu, ma bụrụkwa akụkụ nke ndị nchebe Russia na Agha Hsimucheng, na Agha Te-li-Ssu. N'agha nke Liaoyang na na
Agha nke Shaho, o nyere iwu ka ndị agha ndị Russia na-agba ịnyịnya na-ekpuchi ndị nche azụ nke ndị Russia na-alaghachi. A buliri ya n'ọkwa lieutenant general n'ọnwa Ọktoba 1904, ma họpụta ya onye isi ndị Cavalier Corps ọhụrụ na Disemba 1904 ma duzie nnukwu mwakpo na ndịda na 6 Jenụwarị 1905 na ndị na-agba ịnyịnya 6000 na ebumnuche ibibi ihe ndị Japan na-echekwa na Niuchang. Ọrụ ahụ bụ ọdachi, ndị agha ahụ lọghachikwara ụbọchị iri na abụọ ka e mesịrị na nnukwu ọnwụ. Ọ merụrụ ahụ n'ụkwụ n'oge Agha Sandepu ma ọ bụ ezie na e weghachiri ya dị ka ọchịagha nke Cavalier Corps na Machị 1905, anọghị na Agha Mukden.