Aigun 1900 Russo-Chinese War
In the aftermath of the Boxer Rebellion,
Russians on the Amur under General Deian Subotich advanced through Sakhalin on the Chinese at Aigun (in modern Heihe in Heilongjiang). In very heavy house-to-house fighting, Aigun was stormed by General Pavel Rennenkampf.
The Russians then marched south through Mergen (Nenjiang) to the Chinese Eastern Railway at Qiqihar (2–5 August 1900).