During the Russo-Japanese War of 1904-1905, Bilderling commanded the 17th European Army Corps from May 1904, accompanying it to Manchuria in the summer of the same year. He was in command of the eastern flank at the Battle of Liaoyang and of the western flank at the Battle of Shaho. After the Battle of Sandepu, Bilderling replaced Alexander Kaulbars as commander of the Third Manchurian Army. However, after the Battle of Mukden, he was relieved of his command from May–September 1905 and was replaced as commander of the Third Manchurian Army by General Mikhail Batyanov. He was later bitterly blamed by General Aleksey Kuropatkin for the defeat. He served as a member of the Board of War from 1905-1912.