Nikolai Tretyakov
Nikolai A. Tretyakov February 1917 was a military engineer and general in the Imperial Russian Army, noted for his heroic role in the Siege of Port Arthur during the RussianJapanese War.
Tretyakov was born in Simbirsk, where his family were members of the local nobility. He graduated from the 2nd Moscow Military Gymnasium on August 10, 1872 and entered military service. In 1875, after graduation from the Nikolaev Engineering School, he was commissioned as a second lieutenant. He was promoted to lieutenant on July 13, 1877 and returned to the Nikolaev Academy of Engineering from which he graduated in 1878, and was subsequently promoted to captain. He became a lieutenant colonel in April 1892, and was assigned command of a sapper company at Vladivostok in April 1893. On May 21, 1895 he became commander of the 1st East Siberian Demining Brigade.
Source: Wikipedia